Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Document Fiscal Year Focus			2014
Other comprehensive income (loss):
Effective portion of change in fair value of derivative instruments	$ (3,651)	$ 521	$ (28,603)	$ 22,225
Parent Company [Member]
Net income	(53,440)	(40,664)	(109,659)	(99,268)
Other comprehensive income (loss):
Amortization of net loss on settled derivative instruments recognized in net income	2,107	2,367	6,639	7,099
Effective portion of change in fair value of derivative instruments	(3,651)	521	(28,603)	22,225
Less: reclassification adjustment for change in fair value of derivative instruments included in net income	153	8	459	24
Available-for-sale Securities, Gross Unrealized Gain	3,895	0	4,809	0
Other comprehensive (loss) income	2,504	2,896	(16,696)	29,348
Comprehensive income	55,944	43,560	92,963	128,616
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(232)	(400)	(1,048)	(1,055)
Other comprehensive income (loss) attributable to noncontrolling interests	56	6	(137)	63
Comprehensive income attributable to noncontrolling interests	288	406	911	1,118
Comprehensive income attributable to the Company	55,656	43,154	92,052	127,498
Partnership Interest [Member]
Net income	(53,440)	(40,664)	(109,659)	(99,268)
Other comprehensive income (loss):
Amortization of net loss on settled derivative instruments recognized in net income	2,107	2,367	6,639	7,099
Effective portion of change in fair value of derivative instruments	(3,651)	521	(28,603)	22,225
Less: reclassification adjustment for change in fair value of derivative instruments included in net income	153	8	459	24
Available-for-sale Securities, Gross Unrealized Gain	3,895	0	4,809	0
Other comprehensive (loss) income	2,504	2,896	(16,696)	29,348
Comprehensive income	55,944	43,560	92,963	128,616
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(142)	(327)	(863)	(872)
Other comprehensive income (loss) attributable to noncontrolling interests	52	1	(108)	8
Comprehensive income attributable to noncontrolling interests	194	328	755	880
Comprehensive income attributable to the Company	$ 55,750	$ 43,232	$ 92,208	$ 127,736