Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Supplemental Disclosures:
Cash paid for interest	$ 72,298	$ 68,908
Cash paid for income taxes	843	4,503
Non-cash investing and financing activities:
Accrued capital expenditures and real estate developments	1,716	720
Accrued repurchases of common stock to settle tax obligation	0	208
Distributions declared and unpaid	$ 139,405	$ 140,232