| 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 |
| Net income | 0.0 | -1.1 | 0.8 | 1.9 | -0.7 | 0.0 | 4.8 | 5.4 |
| Depreciation and amortization [+] | 8.2 | 8.2 | 7.7 | 8.4 | 9.1 | 9.7 | 10.3 | 11.7 |
| Depreciation | 8.2 | 8.2 | 7.7 | 8.4 | 9.1 | 9.7 | 10.3 | 11.7 |
| Stock-based compensation | 0.2 | 0.3 | 0.3 | 0.4 | 0.6 | 0.7 | 0.8 | 0.9 |
| Deferred taxes | 0.0 | 0.0 | -0.1 | -0.5 | -0.7 | -0.5 | -0.3 | -0.4 |
| Change in working capital [+] | 1.5 | -0.7 | 1.0 | 0.0 | -2.1 | 1.4 | -3.1 | -1.6 |
| Accounts receivable | -0.7 | -0.1 | -0.6 | 0.9 | 0.4 | -0.2 | -0.1 | -0.9 |
| Inventories | 0.0 | 0.0 | 0.0 | -0.1 | 0.2 | 0.0 | -0.1 | 0.1 |
| Other current assets | 0.0 | -0.4 | 0.2 | -0.1 | 0.2 | 0.7 | 0.3 | -1.0 |
| Accounts payable | 0.3 | 0.0 | 0.1 | -0.7 | -0.5 | 0.9 | -0.5 | 0.6 |
| Accrued expenses | 1.8 | -0.1 | 1.2 | 0.2 | -2.4 | 0.2 | -1.6 | -0.4 |
| Deferred revenues | | | | 0.0 | -0.1 | 0.1 | 0.1 | -0.1 |
| Income taxes | | | | | | -0.1 | -0.9 | 0.9 |
| Other | 0.2 | -0.1 | 0.1 | -0.2 | 0.1 | -0.1 | -0.3 | -0.9 |
| Other operating activities | 0.0 | 0.1 | 0.6 | -0.4 | 0.1 | -0.2 | 0.7 | -0.3 |
| Cash from operations | 10.0 | 6.7 | 10.4 | 9.7 | 6.3 | 11.1 | 13.2 | 15.7 |
| |
| Capital expenditures [+] | -4.8 | -2.2 | -2.8 | -1.7 | -0.9 | -1.6 | -2.6 | -1.9 |
| Purchases of property and equipment | -4.8 | -2.2 | -2.8 | -1.7 | -0.9 | -1.6 | -2.6 | -1.9 |
| Sales of property and equipment | | | | 0.0 | | | | |
| Purchases of short-term investments, net | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | -0.1 |
| Purchases of short-term investments | 0.0 | -0.1 | -0.1 | 0.0 | 0.0 | 0.0 | | -0.3 |
| Sales of short-term investments | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | 0.2 |
| Other cash from investing | | | | | | 0.1 | | |
| Cash from investing | -4.8 | -2.2 | -2.8 | -1.6 | -0.9 | -1.5 | -2.6 | -1.9 |
| |
| Cash dividends paid | | | | | | -0.1 | -0.1 | -3.9 |
| Repurchase of common stock, net | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | | -0.2 |
| Financing costs | 0.0 | 0.0 | 0.0 | -0.1 | -0.1 | | -3.6 | -0.3 |
| Other cash from financing | -5.0 | -5.4 | -6.3 | -7.7 | -8.2 | -11.5 | -17.7 | -10.1 |
| Cash from financing | -5.0 | -5.5 | -6.4 | -7.7 | -8.2 | -11.7 | -14.2 | -13.9 |
| |
| Free cash flow | 5.2 | 4.5 | 7.5 | 8.1 | 5.4 | 9.6 | 10.5 | 13.8 |
| Per share (diluted) | $0.16 | $0.14 | $0.23 | $0.25 | $0.17 | $0.30 | $0.33 | $0.44 |
| |
| Cash paid for interest | 0.8 | 0.8 | 0.8 | 1.1 | 1.6 | 1.5 | 1.7 | 2.8 |
| Cash paid for income taxes | -0.2 | 0.1 | 0.6 | 1.5 | 0.6 | 1.0 | 4.9 | 3.3 |