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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Change in fair value derivative instruments designated as cash flow hedges, income tax effect $ (2,144) $ 3,354
Reclassification of realized loss on interest rate swap agreements designated as cash flow hedges, income tax effect (606) (352)
Cumulative effect for the adoption of ASU 2017-12, Income Tax Effect $ 277 $ 0