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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | $ 500 |  | $ 500 |  |
Foreign Currency Transaction Gain (Loss), before Tax | (600) | $ 300 | (700) | $ 300 |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 1,400 |  | 1,400 |  | $ (5,700)
Prepaid Expenses And Other Current Assets and Non-current Other Assets [Domain] |  |  |  |  |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Fair value, assets | 3,039 |  | 3,039 |  |
Derivative Liability, Fair Value, Gross Liability | (1,607) |  | (1,607) |  |
Derivative Assets (Liabilities), at Fair Value, Net | 1,432 |  | 1,432 |  |
Other Current Liabilities [Member] |  |  |  |  |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Fair value, assets |  |  |  |  | 350
Derivative Liability, Fair Value, Gross Liability |  |  |  |  | (6,023)
Derivative Assets (Liabilities), at Fair Value, Net |  |  |  |  | (5,673)
Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | 400 | (400) | 300 | (600) |
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses And Other Current Assets and Non-current Other Assets [Domain] |  |  |  |  |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Fair value, assets | 3,025 |  | 3,025 |  |
Derivative Liability, Fair Value, Gross Liability | (1,487) |  | (1,487) |  |
Derivative Assets (Liabilities), at Fair Value, Net | 1,538 |  | 1,538 |  |
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 |  |  |  |  | 346
Derivative Liability, Fair Value, Gross Liability |  |  |  |  | (5,945)
Derivative Assets (Liabilities), at Fair Value, Net |  |  |  |  | (5,599)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of cash flow hedges | 34,300 |  | 34,300 |  |
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts [Member] | Prepaid Expenses And Other Current Assets and Non-current Other Assets [Domain] |  |  |  |  |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Fair value, assets | 14 |  | 14 |  |
Derivative Liability, Fair Value, Gross Liability | (120) |  | (120) |  |
Derivative Assets (Liabilities), at Fair Value, Net | (106) |  | (106) |  |
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 |  |  |  |  | 4
Derivative Liability, Fair Value, Gross Liability |  |  |  |  | (78)
Derivative Assets (Liabilities), at Fair Value, Net |  |  |  |  | $ (74)
Cash Flow Hedging [Member] | Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of cash flow hedges | 136,900 |  | 136,900 |  |
Cash flow hedges realized gains (losses) | $ (400) | $ 200 | $ (1,600) | $ 600 |

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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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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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