Schedule III - Reconciliation of Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance, beginning of year	$ 748,341	$ 662,236	$ 654,631
Depreciation for the period	96,813	85,872	80,057
Dispositions and reclasses to and from rental property held for sale	(30,571)	233	(72,452)
Balance, end of year	$ 814,583	$ 748,341	$ 662,236