Leases (Schedule of Maturity of Lease Liabilities) (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating Leases
2019	$ 53,597
2020	136,283
2021	57,190
2022	54,955
2023	54,453
Remaining	471,202
Total future minimum lease payments	827,680
Less imputed interest	(253,403)
Present value of lease liabilities	574,277
Finance Leases
2019	267
2020	1,069
2021	1,069
2022	1,069
2023	1,069
Remaining	5,610
Total future minimum lease payments	10,153
Less imputed interest	(1,985)
Present value of lease liabilities	8,168
Total
2019	53,864
2020	137,352
2021	58,259
2022	56,024
2023	55,522
Remaining	476,812
Total future minimum lease payments	837,833
Less imputed interest	(255,388)
Present value of lease liabilities	582,445
Minimum lease payments for leases signed but not yet commenced	$ 272,600
Lease duration for leases signed but not yet commenced	20 years