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Market Risks and Derivative Hedge Contracts (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items] |  |  |
Total | $ (474) | $ (474) | $ (362)
Derivative [Line Items] |  |  |
Net gains associated with foreign currency derivatives | 1,100 | 1,200 |
Forward Purchase Contract, Pounds Sterling [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 6,980 | $ 6,980 |
Traded exchange rate | 1.42 | 1.42 |
Value date | Jul. 18, 2016 |  |
Forward Purchase Contract, Mexican Pesos [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 6,990 | $ 6,990 |
Traded exchange rate | 19.03 | 19.03 |
Value date | Jul. 18, 2016 |  |
Forward Sale Contract, Mexican Pesos (2) [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 2,943 | $ 2,943 |
Traded exchange rate | 19.03 | 19.03 |
Value date | Jul. 18, 2016 |  |
Forward Purchase Contract, Euro [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 7,415 | $ 7,415 |
Traded exchange rate | 1.13 | 1.13 |
Value date | Jul. 18, 2016 |  |
Forward Sale Contract, Norwegian Krone [Member] |  |  |
Derivative [Line Items] |  |  |
U.S. Dollar notional amount | $ 1,759 | $ 1,759 |
Traded exchange rate | 8.36 | 8.36 |
Value date | Jul. 18, 2016 |  |
Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Forward purchase contracts | $ 0 | $ 0 | 0
Forward sale contracts | 271 | 271 | 23
Current Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Forward purchase contracts | (634) | (634) | (354)
Forward sale contracts | $ (111) | $ (111) | $ (31)

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