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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Derivative [Line Items] |  |  |  |  |
Gains (losses) on intercompany receivables | $ (300) | $ 400 | $ 100 | $ (300) |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Fair value, assets | 2,121 |  | 2,121 |  | $ 2,935
Fair value, liabilities | (1,976) |  | (1,976) |  | (1,064)
Derivative Assets (Liabilities), at Fair Value, Net | 145 |  | 145 |  | 1,871
Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forward contracts not designated as hedging instruments net realized gains (losses) | 0 | (700) | (200) | 0 |
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 | 2,111 |  | 2,111 |  | 2,931
Fair value, liabilities | (1,920) |  | (1,920) |  | (1,026)
Derivative Assets (Liabilities), at Fair Value, Net | 191 |  | 191 |  | 1,905
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of cash flow hedges | 19,600 |  | 19,600 |  |
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 | 10 |  | 10 |  | 4
Fair value, liabilities | (56) |  | (56) |  | (38)
Derivative Assets (Liabilities), at Fair Value, Net | (46) |  | (46) |  | $ (34)
Cash Flow Hedging [Member] | Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of cash flow hedges | 101,100 |  | 101,100 |  |
Cash flow hedges realized gains | 0 | $ 2,400 | 500 | $ 5,000 |
Unrealized gains on cash flow hedges in accumulated other comprehensive income (loss) expected to be recognized in the next fiscal year | $ 100 |  | $ 100 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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