Leases (Schedule of Maturity of Lease Liabilities) (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Leases
2019	$ 112,185
2020	107,652
2021	59,788
2022	54,548
2023	54,041
Remaining	474,598
Total future minimum lease payments	862,812
Less imputed interest	(266,009)
Present value of lease liabilities	596,803
Finance Leases
2019	534
2020	1,069
2021	1,069
2022	1,069
2023	1,069
Remaining	5,610
Total future minimum lease payments	10,420
Less imputed interest	(2,083)
Present value of lease liabilities	8,337
Total
2019	112,719
2020	108,721
2021	60,857
2022	55,617
2023	55,110
Remaining	480,208
Total future minimum lease payments	873,232
Less imputed interest	(268,092)
Present value of lease liabilities	605,140
Minimum lease payments for leases signed but not yet commenced	$ 271,800
Lease duration for leases signed but not yet commenced	20 years