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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