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Share Based Payments (Schedule of Outstanding Units Activity) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
Deferred Share Units [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, other than options, beginning | shares | 883,068 | 1,016,416
Granted, other units | shares | 91,108 | 201,319
Paid, other units | shares |  | (238,027)
Increase (decrease), other units | shares |  | (96,640)
Outstanding, other than options, ending | shares | 974,176 | 883,068
Outstanding, beginning balance, fair value | $ 4,992 | $ 2,279
Fair Value, granted, other units | 429 | 781
Outstanding, ending balance, fair value | 5,094 | 4,992
Fair Value, Paid in Cash, other units |  | (1,721)
Fair value increase (decrease), other units |  | (902)
Change in fair value, other units | $ (327) | $ 4,555
Restricted Share Units [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, other than options, beginning | shares | 1,337,720 | 1,015,846
Paid, other units | shares | (406,022) | (419,019)
Forfeited or cancelled, other units | shares | (5,007) | (49,053)
Outstanding, other than options, ending | shares | 1,371,227 | 1,337,720
Less: Equity grants to executive director and officers | shares | (390,751) |
Cash settleable other units | shares | 980,476 |
Outstanding, beginning balance, fair value | $ 4,489 | $ 2,179
Fair value, forfeited or cancelled, other units | (5) |
Outstanding, ending balance, fair value | 5,780 | 4,489
Fair Value, Paid in Cash, other units | (2,114) | (2,104)
Change in fair value, other units | 1,310 | $ 1,421
Less: Fair value grants to executive director and officers | (1,845) |
Fair value cash settleable other units | $ 3,935 |
Restricted Share Units [member] | Executive Director [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Granted, other units | shares |  | 317,276
Fair Value, granted, other units |  | $ 1,161
Restricted Share Units [member] | Officers [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Granted, other units | shares | 406,499 | 389,991
Fair Value, granted, other units | $ 1,919 | $ 1,509
Restricted Share Units [member] | Employee [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Granted, other units | shares | 38,037 | 82,679
Fair Value, granted, other units | $ 181 | $ 323
Performance Share Units [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, other than options, beginning | shares | 885,535 | 1,236,620
Paid, other units | shares | (332,076) | (247,324)
Forfeited or cancelled, other units | shares |  | (103,761)
Outstanding, other than options, ending | shares | 553,459 | 885,535
Outstanding, beginning balance, fair value | $ 3,545 | $ 1,194
Outstanding, ending balance, fair value | 2,691 | 3,545
Fair Value, Paid in Cash, other units | (1,770) | (961)
Change in fair value, other units | $ 916 | $ 3,312

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