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Market Risks and Derivative Hedge Contracts (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | 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 | $ (61) |  | $ (61) |  | $ (127) |
Derivative [Line Items] |  |  |  |  |  |
Net gains associated with foreign currency derivatives | 700 | $ 400 | 800 | $ 1,100 |  |
Forward Purchase Contract, Euro [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
U.S. Dollar notional amount | $ 464 |  | $ 464 |  |  |
Traded exchange rate | 1.16 |  | 1.16 |  |  |
Value date | Jul. 19, 2018 |  |  |  |  |
Forward Purchase Contract, Euro [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
U.S. Dollar notional amount | $ 27,437 |  | $ 27,437 |  |  |
Traded exchange rate | 10.16 |  | 10.16 |  |  |
Value date | Jul. 19, 2018 |  |  |  |  |
Forward Purchase Contract, Pounds Sterling [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
U.S. Dollar notional amount | $ 2,521 |  | $ 2,521 |  |  |
Traded exchange rate | 1.33 |  | 1.33 |  |  |
Value date | Jul. 19, 2018 |  |  |  |  |
Forward Purchase Contract, Brazil Real [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
U.S. Dollar notional amount | $ 5,941 |  | $ 5,941 |  |  |
Traded exchange rate | 1.31 |  | 1.31 |  |  |
Value date | Jul. 19, 2018 |  |  |  |  |
Forward Purchase Contract, Mexican Pesos [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
U.S. Dollar notional amount | $ 1,692 |  | $ 1,692 |  |  |
Traded exchange rate | 20.68 |  | 20.68 |  |  |
Value date | Jul. 19, 2018 |  |  |  |  |
Forward Sale Contract, Norwegian Krone [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
U.S. Dollar notional amount | $ 985 |  | $ 985 |  |  |
Traded exchange rate | 8.12 |  | 8.12 |  |  |
Value date | Jul. 19, 2018 |  |  |  |  |
Forward Sale Contract, Mexican Pesos (2) [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
U.S. Dollar notional amount | $ 6,083 |  | $ 6,083 |  |  |
Traded exchange rate | 20.71 |  | 20.71 |  |  |
Value date | Jul. 19, 2018 |  |  |  |  |
Current Assets [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Forward purchase contracts | $ 22 |  | $ 22 |  |  | $ 130
Forward sale contracts | 158 |  | 158 |  | 111 |
Current Liabilities [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Forward purchase contracts | 0 |  | 0 |  | (113) |
Forward sale contracts | $ (241) |  | $ (241) |  | $ (255) |

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