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Comprehensive income (Tables)

3 Months Ended

Mar. 31, 2016

Statement Of Income And Comprehensive Income [Abstract]

Comprehensive income

		For the three months ended
		March 31, 2016
		Interest								Foreign				Accumulated
		rate swap								currency				other
		and cap				Investment				translation				comprehensive
		agreements				securities				adjustments				(loss) income
Beginning balance		$	(10,925	)		$	1,361			$	(50,262	)		$	(59,826	)
Unrealized (losses) gains			(8,951	)			342				11,181				2,572
Related income tax benefit (expense)			3,482				(113	)			—				3,369
			(5,469	)			229				11,181				5,941
Reclassification from accumulated other comprehensive income into net income			761				(152	)			—				609
Related income tax (expense) benefit			(296	)			59				—				(237	)
			465				(93	)			—				372
Ending balance		$	(15,929	)		$	1,497			$	(39,081	)		$	(53,513	)

		For the three months ended
		March 31, 2015
		Interest								Foreign				Accumulated
		rate swap								currency				other
		and cap				Investment				translation				comprehensive
		agreements				securities				adjustments				income (loss)
Beginning balance		$	(1,795	)		$	3,151			$	(26,373	)		$	(25,017	)
Unrealized (losses) gains			(9,451	)			544				(17,885	)			(26,792	)
Related income tax benefit (expense)			3,691				(162	)			—				3,529
			(5,760	)			382				(17,885	)			(23,263	)
Reclassification from accumulated other comprehensive income into net income			1,332				(257	)			—				1,075
Related income tax (expense) benefit			(520	)			100				—				(420	)
			812				(157	)			—				655
Ending balance		$	(6,743	)		$	3,376			$	(44,258	)		$	(47,625	)