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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Tax (benefit) provision on unrealized gain (loss) on marketable securities $ 0 $ 0 $ 0
Tax (benefit) provision of unrealized loss on interest rate swap (5,914) (6,692) 3,667
Tax (benefit) provision of reclassification adjustment $ 4,987 $ 4,256 $ 4,182