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Leases - Lease Cost Finance And Operating Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Operating Lease, Cost [1] $ 5,225 $ 15,266
Finance lease cost    
Amortization of leased assets [2] 1,144 3,955
Interest on finance lease obligations 84 268
Total lease costs $ 6,453 $ 19,489
[1] Includes variable lease costs of $0.5 million and $1.5 million, respectively, and short-term lease costs of $0.2 million and $0.6 million, respectively.
[2] Includes variable lease costs of $0.2 million and $0.7 million, respectively.