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Leases - Maturity of Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases [Abstract]      
Six months ending December 31, 2019 $ 2,984    
2020 11,697    
2021 10,491    
2022 6,942    
2023 4,084    
2024 2,364    
Thereafter 7,466    
Total lease payments 46,028    
Less: imputed interest (5,098)    
Present value of lease liabilities $ 40,930 $ 34,200  
Leases Payments under Topic 840 [Abstract]      
2019     $ 10,561
2020     8,270
2021     7,283
2022     4,894
2023     2,934
Thereafter     5,911
Total minimum payments     $ 39,853