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Debt (Other Terms of Loan Facility) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Line of Credit [Member] | Federal Funds Rate [Member] | U.S. [Member]    
Line of Credit Facility [Line Items]    
Variable rate, spread over reference rate 0.50%  
Line of Credit [Member] | Prime Rate [Member] | U.S. [Member]    
Line of Credit Facility [Line Items]    
Variable rate, spread over reference rate 1.00%  
Line of Credit [Member] | Minimum [Member] | Canadian [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 3.00%  
Line of Credit [Member] | Minimum [Member] | Base Rate [Member] | U.S. [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 3.00%  
Line of Credit [Member] | Minimum [Member] | LIBOR [Member] | U.S. [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 4.00%  
Line of Credit [Member] | Minimum [Member] | LIBOR [Member] | Canadian [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 4.00%  
Line of Credit [Member] | Maximum [Member] | Canadian [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 4.00%  
Line of Credit [Member] | Maximum [Member] | Base Rate [Member] | U.S. [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 4.00%  
Line of Credit [Member] | Maximum [Member] | LIBOR [Member] | U.S. [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 5.00%  
Line of Credit [Member] | Maximum [Member] | LIBOR [Member] | Canadian [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 5.00%  
Loan Facility [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Increase in interest rate upon default 2.00%  
Covenant, minimum liquidity to buyback stock $ 20,000,000.0  
Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Interest charges, percentage 5.80% 5.70%
Debt issuance costs $ 2,000,000  
From November 15, 2016 to November 15, 2017 [Member] | Loan Facility [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Prepayment premium, percent 2.00%  
From November 15, 2017 to November 15, 2018 [Member] | Loan Facility [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Prepayment premium, percent 1.00%  
After November 15, 2018 to the Maturity Date [Member] | Loan Facility [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Prepayment premium, percent 0.00%