Pension (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Non-current asset	$ 0	$ 977
Current liability	2,461	2,297
Long-term liability	43,934	44,274
Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Non-current asset	0	977
Current liability	2,461	2,297
Long-term liability	43,934	44,274
Net accrued benefit liability	$ (46,395)	(45,594)
NETHERLANDS | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net accrued benefit liability		$ 0