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Share Capital, Option Plans and Share-Based Payments - RSU's, DSU's and ESPP (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2016
Dec. 31, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issuance of treasury stock (in shares)     409,922 434,156 755,550
Issuance of treasury stock     $ 0 $ 0 $ 0
Employee Share Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards purchase price discount 15.00% 5.00%      
Common shares eligible for issuance (in shares)     530,170 160,546 148,138
Cash received from employee stock purchase plan     $ 14,800 $ 5,500 $ 3,100
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Units granted (in shares)     19,300 122,072 90,000
Award vesting period     3 years    
Issuance of treasury stock (in shares)     70,000 30,000 44,444
Issuance of treasury stock     $ 1,500 $ 300 $ 1,300
Deferred Stock Units (DSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Units granted (in shares)     91,680 111,716 76,104