Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Document Fiscal Year Focus			2014
Other comprehensive income (loss):
Effective portion of change in fair value of derivative instruments	$ (11,153)	$ 18,332	$ (24,953)	$ 21,704
Parent Company [Member]
Net income	(31,161)	(37,469)	(56,217)	(58,603)
Other comprehensive income (loss):
Amortization of net loss on settled derivative instruments recognized in net income	2,165	2,366	4,532	4,733
Effective portion of change in fair value of derivative instruments	(11,153)	18,332	(24,953)	21,704
Less: reclassification adjustment for change in fair value of derivative instruments included in net income	153	8	305	16
Available-for-sale Securities, Gross Unrealized Gain	914	0	914	0
Other comprehensive (loss) income	(7,921)	20,706	(19,202)	26,453
Comprehensive income	23,240	58,175	37,015	85,056
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(413)	(340)	(814)	(654)
Other comprehensive income (loss) attributable to noncontrolling interests	(108)	43	(194)	57
Comprehensive income attributable to noncontrolling interests	305	383	620	711
Comprehensive income attributable to the Company	22,935	57,792	36,395	84,345
Partnership Interest [Member]
Net income	(31,161)	(37,469)	(56,217)	(58,603)
Other comprehensive income (loss):
Amortization of net loss on settled derivative instruments recognized in net income	2,165	2,366	4,532	4,733
Effective portion of change in fair value of derivative instruments	(11,153)	18,332	(24,953)	21,704
Less: reclassification adjustment for change in fair value of derivative instruments included in net income	153	8	305	16
Available-for-sale Securities, Gross Unrealized Gain	914	0	914	0
Other comprehensive (loss) income	(7,921)	20,706	(19,202)	26,453
Comprehensive income	23,240	58,175	37,015	85,056
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(360)	(270)	(719)	(545)
Other comprehensive income (loss) attributable to noncontrolling interests	(92)	4	(160)	7
Comprehensive income attributable to noncontrolling interests	268	274	559	552
Comprehensive income attributable to the Company	$ 22,972	$ 57,901	$ 36,456	$ 84,504