| 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/A | 10-K/A | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 18.2 | 25.9 | -17.5 | -1.9 | -4.2 | -3.8 | -12.9 | -8.6 |
| Depreciation and amortization | 4.8 | 5.1 | 5.7 | 4.3 | 3.2 | 3.8 | 5.5 | 5.8 |
| Asset impairment charges | 21.5 | | 11.6 | | | | | |
| Stock-based compensation | 2.5 | 1.6 | 1.5 | 1.6 | 1.8 | 1.7 | 2.2 | 2.8 |
| Deferred taxes | -22.1 | -3.0 | 0.1 | 1.2 | 0.4 | | | |
| Change in working capital [+] | 1.4 | -1.4 | -3.0 | -4.6 | 1.2 | -0.8 | -2.2 | 2.4 |
| Accounts receivable | -0.5 | 0.5 | -0.2 | -0.3 | 0.2 | 1.5 | 1.1 | 0.2 |
| Accounts payable | 0.8 | -0.5 | 0.0 | 0.0 | 0.1 | -1.5 | 1.1 | -0.2 |
| Accrued expenses | -0.1 | -1.4 | 0.1 | -1.1 | 1.0 | -1.4 | -2.5 | -0.1 |
| Deferred revenues | 2.7 | 0.7 | -1.9 | -1.1 | -0.1 | 0.5 | -1.1 | 1.3 |
| Other | -1.5 | -0.7 | -0.9 | -2.1 | 0.1 | 0.1 | -0.8 | 1.1 |
| Other operating activities | -24.0 | -22.4 | -1.2 | | | | | |
| Cash from operations | 2.3 | 5.9 | -2.8 | 0.9 | 3.6 | 2.5 | -6.2 | 3.6 |
| |
| Capital expenditures [+] | -3.9 | -2.5 | -3.7 | -3.4 | -1.9 | -1.1 | -1.3 | -2.0 |
| Purchases of property and equipment | -3.9 | -2.5 | -3.7 | -3.4 | -1.9 | -1.1 | -1.3 | -2.0 |
| Sales of property and equipment | | | | | | 0.1 | 0.2 | |
| Acquisitions | | | | 0.1 | -19.9 | -1.8 | -5.4 | |
| Sales of short-term investments, net [+] | | | | 2.0 | 9.4 | 22.2 | -6.3 | 27.3 |
| Purchases of short-term investments | | | | | | | -41.2 | -24.9 |
| Sales of short-term investments | | | | 2.0 | 9.4 | 22.2 | 34.8 | 52.1 |
| Other cash from investing | 28.2 | | | 0.6 | | | | 0.3 |
| Cash from investing | 24.3 | -2.5 | -3.7 | -0.7 | -12.4 | 19.4 | -12.8 | 25.6 |
| |
| Cash dividends paid | -0.1 | -0.1 | 0.0 | -3.5 | -3.5 | | -1.6 | -3.4 |
| Issuance of common stock, net | -1.0 | 7.8 | -0.2 | -0.1 | -0.5 | -0.4 | -0.8 | -0.5 |
| Option exercises | | | | 0.0 | 0.3 | 0.1 | | |
| Other cash from financing | -0.3 | -21.2 | | -0.4 | 0.2 | 0.1 | 0.5 | -0.4 |
| Cash from financing | -1.3 | -13.4 | -0.2 | -4.1 | -4.1 | -0.3 | -2.0 | -4.4 |
| |
| Free cash flow | -1.6 | 3.4 | -6.4 | -2.5 | 1.6 | 1.4 | -7.5 | 1.6 |
| Per share (diluted) | ($0.03) | $0.09 | ($0.18) | ($0.07) | $0.05 | $0.04 | ($0.23) | $0.05 |
| |
| Cash paid for interest | | | | | | | 0.0 | |
| Cash paid for income taxes | 0.1 | 0.1 | 0.2 | 0.2 | | | | |