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Market Risks and Derivative Hedge Contracts (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items] |  |  |
Total | $ 384 |  | $ (362)
Derivative [Line Items] |  |  |
Net gains associated with foreign currency derivatives | 100 | $ 500 |
Forward Purchase Contract, Pounds Sterling [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 7,940 |  |
Traded exchange rate | 1.42 |  |
Value date | Apr. 18, 2016 |  |
Forward Sale Contract, Mexican Pesos [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 7,709 |  |
Traded exchange rate | 17.90 |  |
Value date | Apr. 18, 2016 |  |
Forward Sale Contract, Mexican Pesos (2) [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 2,011 |  |
Traded exchange rate | 17.90 |  |
Value date | Apr. 18, 2016 |  |
Forward Purchase Contract, Euro [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 2,766 |  |
Traded exchange rate | 1.11 |  |
Value date | Apr. 18, 2016 |  |
Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Forward purchase contracts | $ 190 |  | 0
Forward sale contracts | 263 |  | 23
Current Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Forward purchase contracts | 0 |  | (354)
Forward sale contracts | $ (69) |  | $ (31)

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