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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