Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental Disclosures:
Cash paid for interest	$ 68,908	$ 93,713
Cash paid for income taxes	4,503	10,848
Non-cash investing and financing activities:
Accrued capital expenditures and real estate developments	720	1,327
Accrued repurchases of common stock to settle tax obligation	208	223
Distributions declared and unpaid	140,232	130,494
Mortgage notes payable assumed in real estate disposition	$ 0	$ 55,000