Consolidated Statements Of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Consolidated Statements Of Comprehensive Loss [Abstract]
Net income	$ 18,085	$ 17,389	$ 10,409	$ 9,475
Other comprehensive income
Change in fair value of derivative instruments	2,519	107	2,971	401
Less: Reclassification adjustment for change in fair value of derivative instruments included in net income	(312)	(308)	(608)	(575)
Comprehensive income	20,292	17,188	12,772	9,301
Less: Comprehensive (income) loss attributable to noncontrolling interests	(210)	(796)	463	(55)
Comprehensive income attributable to common shareholders	$ 20,082	$ 16,392	$ 13,235	$ 9,246