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Leases - Lease Cost Finance And Operating Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Operating Lease, Cost [1] $ 5,054 $ 10,041
Finance lease cost    
Amortization of leased assets [2] 1,332 2,810
Interest on finance lease obligations 90 184
Total lease costs $ 6,476 $ 13,035
[1] Includes variable lease costs of $0.5 million and $1.0 million, respectively, and short-term lease costs of $0.2 million and $0.4 million, respectively.
[2] Includes variable lease costs of $0.2 million and $0.5 million, respectively.