Leases Schedule of Minimum Lease Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 365,155
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	474,121
Lessee, Operating Lease, Liability, Payments, Due Year Two	443,729
Lessee, Operating Lease, Liability, Payments, Due Year Three	405,176
Lessee, Operating Lease, Liability, Payments, Due Year Four	358,578
Lessee, Operating Lease, Liability, Payments, Due Year Five	306,512
Lessee, Operating Lease, Liability, Payments, Due after Year Five	1,275,632
Lessee, Operating Lease, Liability, Payments, Due	3,628,903
Less Portion Representing Interest, Operating Lease Liability	(635,714)
Operating Lease, Liability	2,993,189
Finance Lease Liabilities, Payments, Due
Finance Lease, Liability, Payments, Remainder of Fiscal Year	30,702
Finance Lease, Liability, Payments, Due Next Twelve Months	37,974
Finance Lease, Liability, Payments, Due Year Two	33,637
Finance Lease, Liability, Payments, Due Year Three	33,860
Finance Lease, Liability, Payments, Due Year Four	33,975
Finance Lease, Liability, Payments, Due Year Five	33,993
Finance Lease, Liability, Payments, Due after Year Five	162,183
Finance Lease, Liability, Payments, Due	366,324
Less Portion Representing Interest, Finance Lease Liability	(89,760)
Finance Lease, Liability	$ 276,564	$ 282,737
Operating Leases Liabilities, Future Payments, Due
Operating Leases, Future Minimum Payments Due, Next Twelve Months		483,488
Operating Leases, Future Minimum Payments, Due in Two Years		462,154
Operating Leases, Future Minimum Payments, Due in Three Years		432,950
Operating Leases, Future Minimum Payments, Due in Four Years		395,462
Operating Leases, Future Minimum Payments, Due in Five Years		349,649
Operating Leases, Future Minimum Payments, Due Thereafter		1,589,949
Operating Leases, Future Minimum Payments Due		3,713,652
Capital Leases Liabilities, Future Payments, Due
Capital Leases, Future Minimum Payments Due, Next Twelve Months		36,754
Capital Leases, Future Minimum Payments Due in Two Years		41,044
Capital Leases, Future Minimum Payments Due in Three Years		34,026
Capital Leases, Future Minimum Payments Due in Four Years		33,690
Capital Leases, Future Minimum Payments Due in Five Years		33,845
Capital Leases, Future Minimum Payments Due Thereafter		194,611
Capital Leases, Future Minimum Payments Due		373,970
Capital Leases, Future Minimum Payments, Interest Included in Payments		(91,233)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments		$ 282,737