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Financial Risk Management and Derivatives (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Foreign Currency Exchange Contracts [Abstract] |  |  |  |  |
Forward foreign currency exchange contracts included in other current liability | $ 449,000 |  | $ 449,000 |  |
Forward foreign currency exchange contracts included in prepaid and other current assets |  |  |  |  | $ 1,179,000
Forward Foreign Currency Exchange Contracts [Member] |  |  |  |  |
Foreign Currency Exchange Contracts [Abstract] |  |  |  |  |
Notional amount of foreign currency derivatives | 31,416,000 |  | 31,416,000 |  | $ 31,304,000
Forward Foreign Currency Exchange Contracts [Member] | General and Administrative Expenses [Member] |  |  |  |  |
Foreign Currency Exchange Contracts [Abstract] |  |  |  |  |
Forward foreign currency exchange contracts | $ (860,000) | $ (1,784,000) | $ (1,628,000) | $ (1,062,000) |
Forward Foreign Currency Exchange Contracts [Member] | Maximum [Member] |  |  |  |  |
Foreign Currency Exchange Contracts [Abstract] |  |  |  |  |
Derivative, Term of Contract |  |  |  |  | 1 year

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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