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Consolidated Statements of Shareholder's Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Pension liability, income tax expense (benefit) $ (213) $ 378 $ (279)
Cash flow hedging gain (loss), income tax expense (benefit) $ 2,654 $ (2,975) $ 202