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Credit Facility (Narrative) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 13, 2018 | Jan. 26, 2018 | Dec. 31, 2018 | Apr. 30, 2015
Disclosure of detailed information about borrowings [line items] |  |  |  |
Secured bank loans received |  |  | $ 30,000 |
Term Credit Facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  |  |  | $ 60,000
Borrowings, maturity |  |  | April 1, 2019 |
Secured bank loans received |  |  |  | $ 40,000
Borrowings, interest rate basis |  |  | Interest on the Credit Facility was calculated using the one, two, three, or six-month US$ LIBOR rates plus a graduated margin based on the Company's leverage ratio, as defined in the Credit Facility. Interest was payable one month in arrears. |
Amended Credit Facility [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, maturity |  | four |  |
Upfront lenders fee and transactions cost |  | $ 793 |  |
Amended Credit Facility [Member] | Bottom of range [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate basis |  | 2.5% |  |
Amended Credit Facility [Member] | Top of range [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate basis |  | 3.5% |  |
Revolving Credit Facility [member] | Entering into significant commitments or contingent liabilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  | $ 40,000 |  |
Non-Revolving Credit Facility [Member] | Entering into significant commitments or contingent liabilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount |  | $ 80,000 |  |
Third Amendment and Restated Credit Facility [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | $ 110,000 |  |  |
Upfront lenders fee and transactions cost | 545 |  |  |
Additional amount in revolving facility | $ 30,000 |  |  |

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