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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net income $ 217,510 $ 218,927 $ 213,315
Other comprehensive (loss) income:      
Unrealized (loss) gain on qualifying cash flow hedging instrument in equity accounted joint ventures before reclassifications, net of tax (note 6) (1,723) (3,085) 131
Realized loss on qualifying cash flow hedging instrument in equity accounted joint ventures reclassified to equity income, net of tax (note 6) 1,075 1,551  
Other comprehensive (loss) income (648) (1,534) 131
Comprehensive income 216,862 217,393 213,446
Non-controlling interest in comprehensive income 16,627 13,489 12,073
General and limited partners' interest in comprehensive income $ 200,235 $ 203,904 $ 201,373