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Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Changes in fair value of derivatives, tax amount $ 0 $ 37 $ 0 $ 111
Changes in defined benefit pension plans, tax amount $ 459 $ 401 $ 1,325 $ 1,241