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Fair Value of Financial Instruments - Change in Estimated Fair Value Contingent Consideration (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
Loss Contingency Accrual [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ 38 | $ 8,717 | $ 0 | $ 0 |  |  |  |  |  |
Initial estimate of contingent consideration liability | 0 | 0 | 8,740 | 3,840 |  |  |  |  |  |
Increase (decrease) in value reflected in income | 0 | (230) | (23) | (3,840) |  |  |  |  |  |
Payment of contingent consideration | (26) | (8,449) | 0 | 0 |  |  |  |  |  |
Balance at end of year | 12 | 38 | 8,717 | 0 |  |  |  |  |  |
Contingent consideration | 12 | 26 | 8,275 | 0 | $ 20 | $ 29 | $ 30 | $ 88 | $ 100 | $ 5,481
Short-term contingent consideration at end of year | 0 | $ 12 | $ 442 | $ 0 |  |  |  |  |  |
Interest on contingent consideration | 100 |  |  |  |  |  |  |  |  |
Cash paid in excess of initial fair value estimate | $ 100 |  |  |  |  |  |  |  |  |

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