Derivatives (Details 1) € in Thousands, $ in Thousands		6 Months Ended
		Jun. 30, 2017 EUR (€)	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivatives not designated as hedging instruments | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional Amount				$ 71,415	$ 42,866
Fair Value Asset Derivatives	[1]			713	12
Fair Value Liability Derivatives	[1]			1,324	162
Derivatives not designated as hedging instruments | Foreign currency option contracts
Derivatives, Fair Value [Line Items]
Notional Amount		€ 180,000			0
Fair Value Asset Derivatives				0	0
Fair Value Liability Derivatives				0	0
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative, Term of Contract		1 year	1 year
Cash Flow Hedge Loss to be Reclassified within Twelve Months			$ 2,252
Derivatives designated as hedging instruments | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional Amount				2,781	2,127
Fair Value Asset Derivatives	[1]			10,154	0
Fair Value Liability Derivatives	[1]			26,090	13
Derivatives designated as hedging instruments | Foreign currency option contracts
Derivatives, Fair Value [Line Items]
Notional Amount				8,989	8,522
Fair Value Asset Derivatives	[1]			78	184
Fair Value Liability Derivatives	[1]			$ 0	0
Derivatives designated as hedging instruments | Cross currency swap contracts
Derivatives, Fair Value [Line Items]
Notional Amount		€ 184,800			$ 0
Aggregate interest paid over the course of the loan | €		34,800
Debt Instrument, Face Amount | €		€ 150,000
Derivative, Maturity Date		Apr. 04, 2022	Apr. 04, 2022

[1] Contracts that mature within the next 12 months are included in Other Current Assets and Other Current Liabilities for asset derivatives and liability derivatives, respectively, on our Condensed Consolidated Balance Sheets. Contracts with maturities greater than 12 months are included in Other Assets and Other Liabilities for asset derivatives and liability derivatives, respectively, on our Condensed Consolidated Balance Sheets. Amounts included in our Condensed Consolidated Balance Sheets are recorded net where a right of offset exists with the same derivative counterparty.