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UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Foreign currency translation adjustments, tax expense (benefit) $ 0 $ 200,000 $ 0 $ 1,500,000
Amortization of pension related costs, tax expense (benefit) 300,000 400,000 800,000 1,300,000
Pension curtailment gain, tax expense (benefit)       300,000
Reclassification into earnings of accumulated losses from the de-designated 2013 Interest Rate Swap, tax expense (benefit) $ 0 $ 400,000 $ 500,000 $ 1,100,000