| In millions, except per share items | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 | Dec-31-08 | Dec-31-07 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 11.4 | 14.0 | 0.8 | 24.0 | 9.5 | -2.8 | 21.9 | 12.5 |
| Depreciation and amortization | 12.6 | 11.4 | 8.9 | 8.2 | 6.5 | 6.0 | 5.8 | 4.8 |
| Stock-based compensation | 2.7 | 1.1 | 0.9 | 0.7 | 0.9 | 0.6 | 0.5 | 0.2 |
| Tax benefit from stock-based compensation | -1.0 | | | | | | | |
| Deferred taxes | 0.8 | 4.2 | 1.4 | -9.3 | 0.3 | -0.2 | 0.4 | 0.1 |
| Change in working capital [+] | -14.4 | -13.2 | -0.9 | -17.1 | -9.1 | 13.8 | -12.7 | -1.8 |
| Accounts receivable | -3.8 | -9.4 | -6.5 | -8.2 | -11.6 | 13.7 | -5.9 | -3.9 |
| Inventories | -2.1 | -3.6 | -3.7 | -2.8 | 2.5 | -0.7 | -1.6 | -2.8 |
| Other current assets | -1.2 | -2.7 | -0.7 | -0.5 | 0.7 | -0.7 | | |
| Accounts payable | -2.6 | -0.9 | 4.3 | -0.5 | 0.9 | -0.9 | 1.1 | 1.1 |
| Income taxes | -0.3 | 0.7 | -0.7 | 0.4 | -1.0 | 2.2 | | |
| Other | -4.4 | 2.8 | 6.5 | -5.6 | -0.5 | 0.3 | -6.2 | |
| Other operating activities | -1.5 | 0.1 | 3.8 | 1.5 | -0.3 | 0.6 | 0.6 | 0.9 |
| Cash from operations | 10.5 | 17.7 | 14.9 | 7.9 | 7.8 | 18.0 | 16.5 | 16.7 |
| |
| Capital expenditures [+] | -8.1 | -18.4 | -9.3 | -6.5 | -7.3 | -7.4 | -8.0 | -8.1 |
| Purchases of property and equipment | -8.1 | -18.4 | -9.3 | -6.5 | -7.3 | -7.4 | -8.0 | -8.1 |
| Sales of property and equipment | 0.0 | 0.0 | 0.1 | 0.1 | 0.6 | 0.4 | | |
| Acquisitions | -0.3 | -16.7 | -12.5 | -4.1 | -0.4 | | | |
| Other cash from investing | | | | | | | 0.1 | |
| Cash from investing | -8.3 | -35.1 | -21.7 | -10.4 | -7.1 | -7.0 | -7.9 | -8.1 |
| |
| Issuance of common stock, net | 0.2 | 0.6 | 0.6 | 0.3 | 0.6 | 0.1 | 0.4 | 0.5 |
| Financing costs | | -0.1 | -0.6 | | | -0.7 | | |
| Other cash from financing | -0.3 | 17.4 | 3.9 | -0.2 | | -6.7 | | |
| Cash from financing | -0.1 | 18.0 | 5.1 | 0.1 | 0.4 | -5.9 | -7.7 | -1.8 |
| |
| Free cash flow | 2.4 | -0.7 | 5.6 | 1.4 | 0.5 | 10.5 | 8.5 | 8.6 |
| Per share (diluted) | $0.06 | ($0.02) | $0.15 | $0.04 | $0.01 | $0.29 | $0.23 | $0.24 |
| |
| Cash paid for interest | 1.3 | 1.1 | 0.9 | 0.7 | 0.8 | 1.4 | | |
| Cash paid for income taxes | 6.0 | 2.8 | 4.1 | 4.0 | 3.5 | 0.8 | | |