Defined Benefit Pension Plans Significant Actuarial Weighted Assumptions (Discount Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.18%	2.59%	2.36%
Actuarial (gain) loss	$ (7,733)	$ 5,211
Percentage of Benefit Plans Denominated in Euro [Domain]
Defined Benefit Plan Disclosure [Line Items]
Percentage of benefit plans denominated in euro	94%
Euro Denominated Benefit Plans [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Support, Methodology and Source Data	we use two discount rates, with consideration of the duration of the plans, using a hypothetical yield curve developed from euro-denominated AA-rated corporate bond issues, partially weighted for market value, with minimum amounts outstanding of €500 million for bonds with less than 10 years to maturity and €50 million for bonds with 10 or more years to maturity, and excluding the highest and lowest yielding 10% of bonds within each maturity group.
Shorter duration euro denominated defined benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.75%
Longer duration euro denominated defined benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.75%
Defined Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Change in Discount Rate	41 basis points