Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Document Fiscal Year Focus	2016
Net income	$ 166,992	$ 152,543	$ 188,847
Other comprehensive (loss) income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(10,332)	(10,089)	(49,968)
Other comprehensive income (loss)	40,831	(980)	(40,615)
Parent Company [Member]
Net income	166,992	152,543	188,847
Other comprehensive (loss) income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(10,332)	(10,089)	(49,968)
Reclassification adjustment of derivative instruments included in net income	51,139	9,152	9,353
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	24	(43)	7,765
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	0	(7,765)
Other comprehensive income (loss)	40,831	(980)	(40,615)
Comprehensive income	207,823	151,563	148,232
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	2,070	2,487	1,457
Comprehensive income attributable to noncontrolling interests	2,554	2,452	1,186
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	484	(35)	(271)
Comprehensive income attributable to the Company	205,269	149,111	147,046
Partnership Interest [Member]
Net income	166,992	152,543	188,847
Other comprehensive (loss) income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(10,332)	(10,089)	(49,968)
Reclassification adjustment of derivative instruments included in net income	51,139	9,152	9,353
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	24	(43)	7,765
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	0	(7,765)
Other comprehensive income (loss)	40,831	(980)	(40,615)
Comprehensive income	207,823	151,563	148,232
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	1,813	2,247	1,138
Comprehensive income attributable to noncontrolling interests	2,239	2,214	937
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	426	(33)	(201)
Comprehensive income attributable to the Company	$ 205,584	$ 149,349	$ 147,295