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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Tax provision of unrealized gains on derivative financial instruments $ 30 $ (142) $ (29) $ (239)
Tax provision (benefit) on reclassification adjustment for (gains) losses on derivative financial instruments (21) 58 9 71
Tax benefit of amortization of benefit plan costs (25) (157) (208) (313)
Tax (provision) benefit of unrealized gains (losses) 0 (60) 0 (130)
Tax provision on reclassification adjustment for gain on investment $ 0 $ 6 $ 0 $ 14