Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other comprehensive income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 30,952	$ 4,245	$ 18
Partnership [Member]
Net income	151,285	26,209	55,788
Partnership Interest [Member]
Net income	151,285	26,209	55,788
Other comprehensive income:
Unrealized loss on derivative instruments	0	0	0
Amortization of loss on derivative instruments	9,466	9,466	9,467
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	30,985	4,220	11
Less: reclassification adjustment for change in fair value of derivative instruments included in net income	(33)	25	7
Other comprehensive income	40,418	13,711	9,485
Comprehensive income	191,703	39,920	65,273
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	1,205	865	590
Comprehensive income attributable to noncontrolling interests	1,237	834	599
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	32	(31)	9
Comprehensive income attributable to the Company	190,466	39,086	64,674
Parent Company [Member]
Net income	151,285	26,209	55,788
Other comprehensive income:
Unrealized loss on derivative instruments	0	0	0
Amortization of loss on derivative instruments	9,466	9,466	9,467
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	30,985	4,220	11
Less: reclassification adjustment for change in fair value of derivative instruments included in net income	(33)	25	7
Other comprehensive income	40,418	13,711	9,485
Comprehensive income	191,703	39,920	65,273
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	1,481	342	4,418
Comprehensive income attributable to noncontrolling interests	1,588	339	4,447
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	107	(3)	29
Comprehensive income attributable to the Company	190,115	39,581	60,826
Noncontrolling Interests in Limited Partners Interest in Consolidated Partnerships [Member] | Parent Company [Member]
Net income	1,205	865	590
Other comprehensive income:
Other comprehensive income	$ 32	$ (31)	$ 9