| In millions, except per share items | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 |
| | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -2.6 | -9.5 | -56.7 | -24.6 | -5.5 |
| Depreciation and amortization | 37.3 | 35.2 | 25.6 | 20.2 | 2.1 |
| Stock-based compensation | 2.6 | 2.5 | 1.0 | 0.9 | 0.0 |
| Deferred taxes | | 0.9 | | | |
| Change in working capital [+] | 2.7 | 7.0 | -0.8 | -15.0 | 0.0 |
| Restricted cash | 0.5 | 3.8 | 5.1 | -16.1 | -7.3 |
| Other | 2.3 | 3.2 | -5.8 | 1.1 | 7.4 |
| Other operating activities | -7.8 | -5.0 | 39.5 | 3.1 | -2.4 |
| Cash from operations | 32.2 | 31.1 | 8.7 | -15.4 | -5.7 |
| |
| Capital expenditures | -14.5 | -25.7 | -37.8 | -102.1 | -30.5 |
| Purchases of property and equipment | -14.5 | -25.7 | -37.8 | -102.1 | -30.5 |
| Other cash from investing | 14.0 | -243.1 | -129.0 | -248.8 | -288.4 |
| Cash from investing | -0.5 | -268.8 | -166.9 | -350.9 | -318.9 |
| |
| Cash dividends paid | -19.7 | -15.0 | -4.3 | -1.3 | |
| Issuance of common stock, net | -11.8 | -12.4 | -31.5 | 22.9 | 228.5 |
| Financing costs | 0.0 | -5.8 | -12.3 | -4.0 | |
| Other cash from financing | 22.9 | 238.5 | 187.7 | 156.2 | 324.0 |
| Cash from financing | -8.5 | 216.8 | 164.3 | 181.9 | 552.5 |
| |
| Free cash flow | 17.7 | 5.5 | -29.1 | -117.5 | -36.2 |
| Per share (diluted) | $0.50 | $0.15 | ($0.76) | ($3.01) | ($0.97) |
| |
| Cash paid for interest | 20.6 | 16.0 | 7.7 | 1.9 | |
| Cash paid for income taxes | 0.2 | 0.2 | | | |