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Commitments and Contingencies - Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Future minimum lease payments required under non-cancelable operating leases      
2019 $ 56,693    
2020 41,733    
2021 26,607    
2022 12,753    
2023 6,530    
Thereafter 8,229    
Total 152,545    
Leases      
Total lease expense $ 53,400 $ 25,500 $ 22,500