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Market Risks and Derivative Hedge Contracts (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items] |  |  |
Total | $ (17,000) | $ (17,000) | $ (174,000)
Derivative [Line Items] |  |  |
Net gains associated with foreign currency derivatives | 200,000 | 300,000 |
Forward Sale Contract, Euro [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 2,403,000 | $ 2,403,000 |
Traded exchange rate | 1.12 | 1.12 |
Value date |  | Jul. 17, 2015 |
Forward Purchase Contract, Pounds Sterling [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 7,491,000 | $ 7,491,000 |
Traded exchange rate | 1.57 | 1.57 |
Value date |  | Jul. 17, 2015 |
Forward Purchase Contract, Brazil Real [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 2,918,000 | $ 2,918,000 |
Traded exchange rate | 1.25 | 1.25 |
Value date |  | Jul. 17, 2015 |
Forward Purchase Contract, Canadian Dollar [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 7,617,000 | $ 7,617,000 |
Traded exchange rate | 15.71 | 15.71 |
Value date |  | Jul. 17, 2015 |
Forward Sale Contract, Mexican Pesos [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 1,640,000 | $ 1,640,000 |
Traded exchange rate | 7.84 | 7.84 |
Value date |  | Jul. 17, 2015 |
Forward Purchase Contract, Norwegian Kroner [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 1,000,000 | $ 1,000,000 |
Traded exchange rate | 3.75 | 3.75 |
Value date |  | Jul. 17, 2015 |
Forward Purchase Contract, Canadian Dollar (2) [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 780,000 | $ 780,000 |
Traded exchange rate | 1.25 | 1.25 |
Value date |  | Jul. 17, 2015 |
Forward Purchase Contract, Mexican Pesos [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 2,066,000 | $ 2,066,000 |
Traded exchange rate | 15.71 | 15.71 |
Value date |  | Jul. 17, 2015 |
Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Forward purchase contracts | $ 128,000 | $ 128,000 | 0
Current Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Forward purchase contracts | (30,000) | (30,000) | (83,000)
Forward sale contracts | $ (115,000) | $ (115,000) | $ (91,000)

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