Leases Maturity of Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
Finance Lease, Liability, Payments, Due Remainder of 2019	$ 7,590
Finance Lease, Liability, Payments, Due 2020	18,859
Finance Lease, Liability, Payments, Due 2021	9,886
Finance Lease, Liability, Payments, Due 2022	14,281
Finance Lease, Liability, Payments, Due 2023	9,969
Finance Lease, Liability, Payments, Due Thereafter	20,726
Finance Lease, Liability, Payments, Due	81,311
Finance Lease, Liability, Imputed Interest	10,570
Finance Lease, Liability	70,741
Lessee, Operating Lease, Liability, Payments, Due Remainder of 2019	65,831
Lessee, Operating Lease, Liability, Payments, Due 2020	68,232
Lessee, Operating Lease, Liability, Payments, Due 2021	60,260
Lessee, Operating Lease, Liability, Payments, Due 2022	50,476
Lessee, Operating Lease, Liability, Payments, Due 2023	42,357
Lessee, Operating Lease, Liability, Payments, Due Thereafter	536,872
Lessee, Operating Lease, Liability, Payments, Due	824,028
Lessee, Operating Lease, Liability, Imputed Interest	330,051
Operating lease liabilities	$ 493,977