| In millions, except per share items | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenues [+] | 114.0 | 105.3 | 90.3 | 131.3 | 258.5 | 180.3 | 128.9 | 108.4 |
| Oil & gas sales | | | | 131.3 | 258.5 | 181.3 | 128.9 | 108.4 |
| Revenue growth | 8.2% | 16.7% | -31.2% | -49.2% | 43.4% | 39.8% | 18.9% | 88.2% |
| Cost of goods sold | 0.0 | 0.0 | 0.0 | 29.0 | 32.7 | 19.2 | 19.0 | 37.6 |
| Gross profit | 114.0 | 105.3 | 90.3 | 102.4 | 225.8 | 161.1 | 109.9 | 70.8 |
| Gross margin | 100.0% | 100.0% | 100.0% | 77.9% | 87.4% | 89.4% | 85.3% | 65.3% |
| Selling, general and administrative [+] | 29.8 | 33.0 | 33.0 | 39.4 | 48.0 | 26.5 | 34.2 | 17.9 |
| Sales and marketing | | | | | | | 9.3 | |
| General and administrative [+] | 29.8 | 33.0 | 33.0 | 39.4 | 48.0 | 26.5 | 24.9 | 17.9 |
| General and administrative expenses | 20.9 | 24.3 | 24.7 | 28.3 | 32.1 | 26.5 | 24.9 | 17.9 |
| Operating taxes | 8.9 | 8.6 | 8.2 | 11.1 | 15.9 | 12.8 | 9.3 | |
| Other selling, general and administrative | | | | | | | 9.3 | |
| Equity in earnings | | | | | -0.2 | 0.2 | -0.1 | |
| Other operating expenses [+] | 21.5 | 21.6 | 23.2 | 5.9 | 3.8 | 14.0 | 4.6 | 9.5 |
| Exploration expenses | 0.4 | 3.7 | 3.9 | 4.4 | 3.8 | 2.2 | 4.6 | 9.5 |
| EBITDA [+] | 62.6 | 50.8 | 34.2 | 57.1 | 173.8 | 120.7 | 71.1 | 43.3 |
| EBITDA growth | 23.3% | 48.7% | -40.1% | -67.2% | 44.0% | 69.8% | 64.0% | 35.3% |
| EBITDA margin | 54.9% | 48.2% | 37.8% | 43.4% | 67.2% | 67.0% | 55.1% | 40.0% |
| Depreciation and amortization | 61.4 | 70.5 | 79.0 | 109.3 | 106.8 | 77.0 | 60.4 | 32.5 |
| EBIT [+] | 1.2 | -19.7 | -44.9 | -52.3 | 67.0 | 43.7 | 10.7 | 10.9 |
| EBIT growth | -106.1% | -56.1% | -14.1% | -178.0% | 53.1% | 309.1% | -1.5% | 10.8% |
| EBIT margin | 1.1% | -18.7% | -49.7% | -39.8% | 25.9% | 24.3% | 8.3% | 10.0% |
| Non-recurring items [+] | | | | 220.2 | | | | |
| Asset impairment | | | | 220.2 | | | | 18.5 |
| Interest expense | 25.1 | 21.1 | 27.3 | 25.1 | 21.7 | 14.1 | 4.7 | 3.4 |
| Interest expense | 25.1 | 21.1 | 27.3 | 25.1 | 21.7 | 14.1 | 4.7 | 3.4 |
| Other income (expense), net [+] | -0.3 | 4.8 | -4.5 | 30.0 | 44.5 | 85.1 | 3.8 | 3.3 |
| Gain (loss) on sale of assets | | | | | | 90.7 | | |
| Gain (loss) on debt retirement | | 5.1 | -0.6 | 10.6 | | | | |
| Gain (loss) on derivative instruments | -0.3 | -0.3 | -5.5 | 19.3 | | | | |
| Unrealized gain/loss on derivatives | | | | | 2.4 | | -0.1 | 3.4 |
| Write-off of deferred debt issuance costs | | 5.1 | -0.6 | 10.6 | | | | |
| Other | 0.0 | 0.0 | 1.5 | 0.2 | 0.1 | | | |
| Pre-tax income | -24.3 | -35.9 | -76.7 | -267.5 | 89.9 | 114.8 | 9.7 | 10.7 |
| Income taxes | -4.3 | 76.4 | -24.4 | -93.4 | 33.7 | 42.5 | 3.3 | 3.5 |
| Tax rate | 17.9% | | 31.9% | 34.9% | 37.5% | 37.0% | 34.3% | 32.5% |
| Net income | -19.9 | -112.4 | -52.2 | -174.1 | 56.2 | 72.3 | 6.4 | 7.2 |
| Net margin | -17.5% | -106.7% | -57.9% | -132.6% | 21.7% | 40.1% | 5.0% | 6.7% |
| |
| Basic EPS [+] | ($0.21) | ($1.35) | ($1.26) | ($4.30) | $1.43 | $1.85 | $0.18 | $0.25 |
| Growth | -84.4% | 7.0% | -70.7% | -401.9% | -23.1% | 914.8% | -27.1% | -26.0% |
| Diluted EPS [+] | ($0.21) | ($1.35) | ($1.26) | ($4.30) | $1.42 | $1.85 | $0.18 | $0.25 |
| Growth | -84.4% | 7.0% | -70.7% | -401.9% | -23.0% | 916.1% | -26.6% | -26.1% |
| |
| Shares outstanding (basic) [+] | 94.6 | 83.4 | 41.5 | 40.5 | 39.4 | 39.0 | 35.0 | 28.9 |
| Growth | 13.4% | 101.0% | 2.5% | 2.7% | 1.1% | 11.5% | 20.9% | 31.1% |
| Shares outstanding (diluted) [+] | 94.6 | 83.4 | 41.5 | 40.5 | 39.4 | 39.0 | 35.0 | 29.2 |
| Growth | 13.4% | 101.0% | 2.5% | 2.6% | 1.0% | 11.4% | 20.1% | 31.3% |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |