Financial Instruments (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives - Fair Value	$ 987	$ 17,057
Liability Derivatives - Fair Value	166	0
Derivatives Designated as Hedging Instruments | Foreign Exchange Forward | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives - Fair Value	473	1,640
Derivatives Designated as Hedging Instruments | Foreign Exchange Forward | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives - Fair Value	166	0
Derivatives Designated as Hedging Instruments | Cross currency interest rate swaps | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives - Fair Value	514	15,417
Derivatives Designated as Hedging Instruments | Cross currency interest rate swaps | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives - Fair Value	$ 0	0
Derivatives Designated as Hedging Instruments | Minimum
Derivatives, Fair Value [Line Items]
Period over which gains and losses are reclassified to earnings	10 years
Derivatives Designated as Hedging Instruments | Maximum
Derivatives, Fair Value [Line Items]
Period over which gains and losses are reclassified to earnings	15 years
Derivatives not designated as hedging instruments | Foreign Exchange Forward | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives - Fair Value	$ 4,459	4,188
Derivatives not designated as hedging instruments | Foreign Exchange Forward | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives - Fair Value	$ 3,372	$ 1,738