Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Tax benefit (provision) of unrealized loss on interest rate swap	$ 4,919	$ (346)	$ 7,744	$ 3,472
Tax provision of reclassification adjustment	$ 1,224	$ 1,074	$ 3,593	$ 3,176