Leases (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	$ 23,722	$ 23,722	$ 46,998
Capital Leases, Future Minimum Payments Due in Two Years	43,681	43,681	51,943
Capital Leases, Future Minimum Payments Due in Three Years	61,946	61,946	57,881
Capital Leases, Future Minimum Payments Due in Four Years	25,721	25,721	21,842
Capital Leases, Future Minimum Payments Due in Five Years	18,614	18,614	15,587
Capital Leases, Future Minimum Payments Due Thereafter	47,754	47,754	40,447
Capital Leases, Future Minimum Payments Due	221,438	221,438	234,698
Capital Leases, Future Minimum Payments, Interest Included in Payments	(24,208)	(24,208)	(22,746)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	197,230	197,230	211,952
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	5,408	5,408	11,295
Lessee, Operating Lease, Liability, Payments, Due Year Two	11,343	11,343	9,550
Lessee, Operating Lease, Liability, Payments, Due Year Three	10,056	10,056	8,251
Lessee, Operating Lease, Liability, Payments, Due Year Four	8,928	8,928	7,282
Lessee, Operating Lease, Liability, Payments, Due Year Five	6,759	6,759	5,397
Lessee, Operating Lease, Liability, Payments, Due after Year Five	45,164	45,164	37,841
Lessee, Operating Lease, Liability, Payments, Due	87,658	87,658	$ 79,616
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(23,051)	(23,051)
Operating Lease, Liability	$ 64,607	$ 64,607
Property Subject to or Available for Operating Lease, Number of Units	64	64
Lease Liability Payments Remainder Of Fiscal Year	$ 29,130	$ 29,130
Lease Liability Payments Due Year Two	55,024	55,024
Lease Liability Payments Due Year Three	72,002	72,002
Lease Liability Payments Due Year Four	34,649	34,649
Lease Liability Payments Due Year Five	25,373	25,373
Lease Liability Payments Due After Year Five	92,918	92,918
Lease Liability Payments Due	309,096	309,096
Lease Liability Undiscounted Excess Amount	47,259	47,259
Lease Liability	261,837	261,837
Operating Lease, Lease Income	700	1,400
Lessor, Operating Lease, Payments to be Received, Next Twelve Months	1,341	1,341
Lessor, Operating Lease, Payments to be Received, Two Years	1,772	1,772
Lessor, Operating Lease, Payments to be Received, Three Years	1,417	1,417
Lessor, Operating Lease, Payments to be Received, Four Years	1,092	1,092
Lessor, Operating Lease, Payments to be Received, Five Years	504	504
Lessor, Operating Lease, Payments to be Received, Thereafter	243	243
Lessor, Operating Lease, Payments to be Received	6,369	6,369
Lease, Cost [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	10,348	21,312
Finance Lease, Interest Expense	1,453	3,284
Finance Lease Cost	11,801	24,596
Operating Lease, Cost	3,074	6,268
Variable Lease, Cost	420	792
Lease, Cost	$ 15,295	$ 31,656