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Comprehensive Income (Loss) (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated other comprehensive income (loss)                      
Net loss $ (29,341) $ (2,480) $ (2,653) $ (7,386) $ (118,030) $ (3,041) $ (4,263) $ (5,603) $ (41,860) $ (130,937) $ (170,928)
Adjustment to pension liability                 2,597 (5,103) 9,408
Tax (expense) benefit                 (1,038) 2,041 (3,763)
Adjustment to pension liability                 1,559 (3,062) 5,645
Foreign currency translation adjustment                 316 444 (1,976)
Total other comprehensive income (loss)                 1,875 (2,618) 3,669
Comprehensive income (loss)                 $ (39,985) $ (133,555) $ (167,259)