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Credit Arrangements (Details)
CAD in Thousands, $ in Thousands
 9 Months Ended
Jun. 03, 2015
USD ($)
Jul. 25, 2013
USD ($)
payment
Sep. 30, 2015
USD ($)
Sep. 30, 2015
CAD
Sep. 30, 2015
USD ($)
Dec. 31, 2014
CAD
Dec. 31, 2014
USD ($)
Dec. 28, 2012
USD ($)
Senior Notes                
Credit arrangements                
Interest rate (as a percent)       3.65% 3.65%      
Required principal payment     $ 7,100          
Initial principal amount               $ 50,000
Senior Notes | Minimum                
Credit arrangements                
Prepayment to be paid on debt     $ 5,000          
Notes Agreement                
Credit arrangements                
Interest rate (as a percent)   3.85%            
Required principal payment   $ 3,600            
Initial principal amount   $ 25,000           $ 25,000
Number of annual principal payments | payment   7            
Notes Agreement | Minimum                
Credit arrangements                
Restrictions on investments, change of control provisions and provisions as a percentage of total assets to be disposed off     20.00%          
Notes Agreement | Maximum                
Credit arrangements                
Initial principal amount $ 75,000              
Commercial Equipment Notes | Minimum                
Credit arrangements                
Interest rate (as a percent)       1.78% 1.78%      
Commercial Equipment Notes | Maximum                
Credit arrangements                
Interest rate (as a percent)       3.85% 3.85%      
Credit Agreement                
Credit arrangements                
Maximum borrowing capacity         $ 125,000      
Available borrowing capacity         112,895      
Additional Period to Issue Notes 3 years              
Credit Agreement | Federal funds rate                
Credit arrangements                
Basis spread on variable rate (as a percent)     0.50%          
Credit Agreement | Minimum                
Credit arrangements                
Prepayment to be paid on debt     $ 5,000          
Restrictions on investments, change of control provisions and provisions as a percentage of total assets to be disposed off     20.00%          
Credit Agreement | Revolving line of credit                
Credit arrangements                
Maximum borrowing capacity         125,000      
Borrowings outstanding         0      
Credit Agreement | Commercial letters of credit                
Credit arrangements                
Total commercial letters of credit outstanding         $ 12,105   $ 4,659  
Canadian Credit Facility | Commercial letters of credit                
Credit arrangements                
Maximum borrowing capacity | CAD       CAD 8,000        
Total commercial letters of credit outstanding | CAD       2,680   CAD 2,563    
Available borrowing capacity | CAD       CAD 5,320        
Annual fee (as a percent)     1.00%          
Canadian Credit Facility | Commercial letters of credit | Maximum                
Credit arrangements                
Term of credit facility     5 years