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Market Risks and Derivative Hedge Contracts (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | $ (161) |  | $ (127) |
Derivative [Line Items] |  |  |  |
Net gains associated with foreign currency derivatives | 0 | $ 700 |  |
Forward Purchase Contract, Euro [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
U.S. Dollar notional amount | $ 1,117 |  |  |
Traded exchange rate | 1.24 |  |  |
Value date | Apr. 18, 2018 |  |  |
Forward Purchase Contract, Pounds Sterling [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
U.S. Dollar notional amount | $ 5,624 |  |  |
Traded exchange rate | 1.41 |  |  |
Value date | Apr. 18, 2018 |  |  |
Forward Purchase Contract, Brazil Real [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
U.S. Dollar notional amount | $ 5,925 |  |  |
Traded exchange rate | 1.30 |  |  |
Value date | Apr. 18, 2018 |  |  |
Forward Purchase Contract, Mexican Pesos [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
U.S. Dollar notional amount | $ 1,653 |  |  |
Traded exchange rate | 18.76 |  |  |
Value date | Apr. 18, 2018 |  |  |
Forward Sale Contract, Norwegian Krone [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
U.S. Dollar notional amount | $ 3,782 |  |  |
Traded exchange rate | 7.75 |  |  |
Value date | Apr. 18, 2018 |  |  |
Forward Sale Contract, Mexican Pesos (2) [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
U.S. Dollar notional amount | $ 6,760 |  |  |
Traded exchange rate | 18.79 |  |  |
Value date | Apr. 18, 2018 |  |  |
Current Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Forward purchase contracts | $ 56 |  |  | $ 130
Forward sale contracts | 48 |  | 111 |
Current Liabilities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Forward purchase contracts | (6) |  | (113) |
Forward sale contracts | $ (259) |  | $ (255) |

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