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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Rent expense $ 15,839 $ 15,325 $ 12,939
Minimum rental commitments, year 1 11,931    
Minimum rental commitments, year 2 8,322    
Minimum rental commitments, year 3 5,888    
Minimum rental commitments, year 4 2,898    
Minimum rental commitments, year 5 2,064    
Minimum rental commitments, thereafter $ 7,659