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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net income $ 53,715 $ 50,667 $ 12,706
Other Comprehensive (loss) income:      
Unrealized loss on valuation of swap agreements (5,611) (2,683) (1,052)
Reclassification of realized interest on swap agreements 3,081 2,749 2,745
Other comprehensive (loss) income (2,530) 66 1,693
Comprehensive income 51,185 50,733 14,399
Comprehensive (income) loss attributable to noncontrolling interests (686) (20,539) 18,248
Comprehensive income attributable to Common Shareholders $ 50,499 $ 30,194 $ 32,647