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Fair Value Measurements - Contingent Consideration Liability (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
May 26, 2017
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
May 31, 2017
USD ($)
FGC              
Additional information              
Potential contingent consideration $ 1,500           $ 1,500
Fair value of the contingent consideration 1,200           $ 1,200
Contingent consideration credited to other operating income (expense)       $ 500      
Contingent consideration debited to other operating income (expense)     $ 800        
Cash payment made $ 33,000 $ 1,500          
Significant Unobservable Inputs (Level 3)              
Rollforward of contingent consideration liability level three fair value measurements              
Payment of earn out liability to FGC sellers         $ (1,469)    
Contingent Consideration Liability | Significant Unobservable Inputs (Level 3)              
Rollforward of contingent consideration liability level three fair value measurements              
Beginning balance         716    
FGC acquisition           $ 1,200  
Change in fair value of contingent consideration liability during year         $ 753 (484)  
Ending balance       $ 716   $ 716  
Additional information              
Number of unobservable inputs | item         2    
Minimum probability of acquired entity meeting contractual operating performance target (as a percent)         33.00%    
Maximum probability of acquired entity meeting contractual operating performance target (as a percent)         100.00%