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Fair Value of Financial Instruments (Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Gains (losses) on intercompany receivables	$ 300	$ (300)	$ 300	$ 100
Derivative Assets and Liabilities at Fair Value [Abstract]
Fair value, assets	1,290		1,290		$ 4,010
Derivative Liability, Fair Value, Gross Liability	(3,091)		(3,091)		(1,564)
Derivative Assets (Liabilities), at Fair Value, Net	(1,801)		(1,801)		2,446
Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Forward contracts not designated as hedging instruments net realized gains (losses)	(400)	0	(600)	(200)
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative Assets and Liabilities at Fair Value [Abstract]
Fair value, assets					3,962
Derivative Liability, Fair Value, Gross Liability					(1,510)
Derivative Assets (Liabilities), at Fair Value, Net					2,452
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Other Current Liabilities [Member]
Derivative Assets and Liabilities at Fair Value [Abstract]
Fair value, assets	1,290		1,290
Derivative Liability, Fair Value, Gross Liability	(2,958)		(2,958)
Derivative Assets (Liabilities), at Fair Value, Net	(1,668)		(1,668)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Notional amount of cash flow hedges	32,800		32,800
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative Assets and Liabilities at Fair Value [Abstract]
Fair value, assets					48
Derivative Liability, Fair Value, Gross Liability					(54)
Derivative Assets (Liabilities), at Fair Value, Net					$ (6)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Other Current Liabilities [Member]
Derivative Assets and Liabilities at Fair Value [Abstract]
Fair value, assets	0		0
Derivative Liability, Fair Value, Gross Liability	(133)		(133)
Derivative Assets (Liabilities), at Fair Value, Net	(133)		(133)
Cash Flow Hedging [Member] | Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Notional amount of cash flow hedges	104,300		104,300
Cash flow hedges realized gains	200	$ 0	600	$ 500
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	$ (1,100)		$ (1,100)

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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