Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Document Fiscal Year Focus	2015
Other comprehensive income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (10,089)	$ (49,968)	$ 30,985
Parent Company [Member]
Net income	152,543	188,847	151,285
Other comprehensive income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(10,089)	(49,968)	30,985
Less: reclassification adjustment of derivative instruments included in net income	9,152	9,353	9,433
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	(43)	7,765	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	(7,765)	0
Other comprehensive income	(980)	(40,615)	40,418
Comprehensive income	151,563	148,232	191,703
Less: comprehensive (loss) income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	2,487	1,457	1,481
Comprehensive income attributable to noncontrolling interests	2,452	1,186	1,588
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	(35)	(271)	107
Comprehensive income attributable to the Company	149,111	147,046	190,115
Partnership Interest [Member]
Net income	152,543	188,847	151,285
Other comprehensive income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(10,089)	(49,968)	30,985
Less: reclassification adjustment of derivative instruments included in net income	9,152	9,353	9,433
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	(43)	7,765	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	(7,765)	0
Other comprehensive income	(980)	(40,615)	40,418
Comprehensive income	151,563	148,232	191,703
Less: comprehensive (loss) income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	2,247	1,138	1,205
Comprehensive income attributable to noncontrolling interests	2,214	937	1,237
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	(33)	(201)	32
Comprehensive income attributable to the Company	$ 149,349	$ 147,295	$ 190,466