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Employee Benefit Plans - Savings Plans (Details)
12 Months Ended
Jan. 01, 2016
CAD
Dec. 31, 2016
CAD
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Defined Contribution Plan Disclosure [Line Items]          
Multi-employer defined benefit plan, contributions     $ 500,000 $ 400,000 $ 400,000
Maximum annual contribution CAD 26,010 CAD 25,370 18,000    
Additional annual contribution     6,000    
Employer discretionary contribution amount     $ 3,900,000 $ 3,100,000 $ 3,000,000
Minimum          
Defined Contribution Plan Disclosure [Line Items]          
Maximum annual contribution employees could elect to contribute, percent   1.00% 1.00%    
Maximum          
Defined Contribution Plan Disclosure [Line Items]          
Maximum annual contribution employees could elect to contribute, percent   75.00% 75.00%    
United States          
Defined Contribution Plan Disclosure [Line Items]          
Employer matching contribution, percent of match   50.00% 50.00%    
Maximum annual contribution employees could elect to contribute, percent   3.00% 3.00%    
Percentage of employees' base salary for which Company contributes a matching contribution   6.00% 6.00%