Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) - Pre-tax and After-tax Components of Other Comprehensive Income (Loss) (Details)

v3.8.0.1
Accumulated Other Comprehensive Income (Loss) - Pre-tax and After-tax Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
After-tax amount      
Pre-tax amount $ 60,500 $ (54,447) $ 648
Tax benefit / (expense) (3,590) (965) 0
Total other comprehensive income (loss) 56,910 (55,412) 648
Defined benefit and other postretirement plans      
After-tax amount      
Pre-tax amount (139) 11,664 648
Tax benefit / (expense) 38 (4,799) 0
Total other comprehensive income (loss) (101) 6,865 648
Net loss (gain) from hedging activities      
After-tax amount      
Pre-tax amount (5,799) 7,350 0
Tax benefit / (expense) 2,209 (2,793) 0
Total other comprehensive income (loss) (3,590) 4,557 0
Foreign currency translation      
After-tax amount      
Pre-tax amount 66,438 (73,461) 0
Tax benefit / (expense) (5,837) 6,627 0
Total other comprehensive income (loss) $ 60,601 $ (66,834) $ 0