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Market Risks and Derivative Hedge Contracts (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |
Total | $ 71,000 |  | $ 71,000 |  | $ 290,000
Derivative [Line Items] |  |  |  |  |
Net gains associated with foreign currency derivatives | 400,000 | $ (1,100,000) | 1,100,000 | $ (1,200,000) |
Forward Purchase Contract, Euro [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
U.S. Dollar notional amount | $ 2,244,000 |  | $ 2,244,000 |  |
Traded exchange rate | 1.12 |  | 1.12 |  |
Value date | Jul. 20, 2017 |  |  |  |
Forward Purchase Contract, Pounds Sterling [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
U.S. Dollar notional amount | $ 4,544,000 |  | $ 4,544,000 |  |
Traded exchange rate | 1.27 |  | 1.27 |  |
Value date | Jul. 20, 2017 |  |  |  |
Forward Purchase Contract, Brazil Real [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
U.S. Dollar notional amount | $ 2,140,000 |  | $ 2,140,000 |  |
Traded exchange rate | 1.35 |  | 1.35 |  |
Value date | Jul. 20, 2017 |  |  |  |
Forward Purchase Contract, Mexican Pesos [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
U.S. Dollar notional amount | $ 7,439,000 |  | $ 7,439,000 |  |
Traded exchange rate | 18.36 |  | 18.36 |  |
Value date | Jul. 20, 2017 |  |  |  |
Forward Sale Contract, Norwegian Krone [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
U.S. Dollar notional amount | $ 2,516,000 |  | $ 2,516,000 |  |
Traded exchange rate | 8.42 |  | 8.42 |  |
Value date | Jul. 20, 2017 |  |  |  |
Forward Sale Contract, Mexican Pesos (2) [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
U.S. Dollar notional amount | $ 3,619,000 |  | $ 3,619,000 |  |
Traded exchange rate | 18.36 |  | 18.36 |  |
Value date | Jul. 20, 2017 |  |  |  |
Current Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Forward sale contracts | $ 218,000 |  | $ 218,000 |  | 81,000
Current Liabilities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Forward purchase contracts | 0 |  | 0 |  | (371,000)
Forward sale contracts | $ (147,000) |  | $ (147,000) |  | $ 0

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