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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease costs $ 11,044 $ 21,909
Short-term lease costs 566 1,429
Variable lease costs 2,685 5,698
Sublease income (1,246) (2,443)
Total lease cost $ 13,049 $ 26,593