Pension (Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 364,809	$ 304,133
Accumulated benefit obligation	359,842	297,320
Fair value of plan assets	318,414	257,562
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	336,648	268,218
Accumulated benefit obligation	336,648	268,218
Fair value of plan assets	318,414	257,562
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	28,161	35,915
Accumulated benefit obligation	23,194	29,102
Fair value of plan assets	$ 0	$ 0