Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Operating Lease Liabilities, Payments Due [Abstract]
2019 (excluding the three months ended March 31, 2019)	$ 93,535
2020	110,711
2021	101,977
2022	88,107
2023	81,356
Thereafter	120,326
Total lease payments	596,012
Less interest	(56,916)
Operating lease liabilities	539,096	$ 574,500
Finance Lease Liabilities, Payments, Due [Abstract]
2019 (excluding the three months ended March 31, 2019)	898
2020	941
2021	297
2022	0
2023	0
Thereafter	0
Total lease payments	2,136
Less interest	(62)
Finance lease liabilities	2,074	$ 2,400
Lease Liabilities, Payments Due [Abstract]
2019 (excluding the three months ended March 31, 2019)	94,433
2020	111,652
2021	102,274
2022	88,107
2023	81,356
Thereafter	120,326
Total lease payments	$ 598,148