Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Minimum Future Rental Receipts [Abstract]
2017	$ 328,054
2018	314,764
2019	283,225
2020	248,427
2021	229,201
Thereafter	1,846,042
Future Minimum Payments Receivable	3,249,713
Leaseholds Interests [Member]
Future Rental Payments [Abstract]
2017	5,186
2018	5,062
2019	4,557
2020	4,549
2021	4,201
Thereafter	30,308
Future Minimum Payments Due	53,863
Rent expense for leasehold interests	987	$ 868	$ 919
Corporate HQ and Office Space [Member]
Future Rental Payments [Abstract]
2017	1,294
2018	1,294
2019	1,295
2020	1,296
2021	1,325
Thereafter	5,575
Rent expense for leasehold interests	1,242	1,435	1,356
LCIF [Member]
Minimum Future Rental Receipts [Abstract]
2017	65,008
2018	59,103
2019	50,008
2020	44,802
2021	41,117
Thereafter	405,828
Future Minimum Payments Receivable	665,866
Future Rental Payments [Abstract]
2017	260
2018	260
2019	260
2020	260
2021	260
Thereafter	2,510
Future Minimum Payments Due	3,810
Rent expense for leasehold interests	$ 286	$ 307	$ 289