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Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Total net rent expense $ 13,300 $ 13,900 $ 9,000
Net Operating Leases      
2017 10,561    
2018 8,270    
2019 7,283    
2020 4,894    
2021 2,934    
Thereafter 5,911    
Total minimum payments 39,853    
Other Contractual Obligations      
2017 1,528    
2018 0    
2019 0    
2020 0    
2021 0    
Thereafter 0    
Total minimum payments $ 1,528