Pension (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension asset	$ 2,939	$ 0
Pension liability (current portion)	2,185	2,461
Pension liability	43,555	43,934
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension asset	2,939	0
Pension liability (current portion)	2,185	2,461
Pension liability	43,555	43,934
Net accrued pension liability	$ (42,801)	$ (46,395)