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Debt (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2013
Line of Credit Facility [Line Items]        
Interest rate description   Borrowings under the 2016 Credit Agreement bear interest at (1) a base rate plus a margin of 0.00% to 0.75%, based on certain financial tests or (2) United States dollar LIBOR (0.52% at September 30, 2016) plus 1.00% to 1.75%, based on certain financial tests. The base rate is determined by the greater of (a) the prime commercial lending rate announced by Bank of Montreal from time to time (3.50% at September 30, 2016), (b) the federal funds effective rate, plus ½ of 1.00%, (c) the daily one month LIBOR rate, plus 1.00%, or (d) 0.00%. The interest rate in effect at September 30, 2016 was 1.77%. Fees for letters of credit issued under the 2016 Revolving Credit Facility range from 1.00% to 1.75% of the respective face amounts of outstanding letters of credit and are computed based on certain financial tests.    
Letters of credit outstanding (in US dollars) $ 115,400,000 $ 115,400,000 $ 99,000,000  
Borrowings under revolving credit facility (in US dollars) 125,000,000 $ 125,000,000 0  
2013 Credit Agreement        
Line of Credit Facility [Line Items]        
Write off of deferred debt issuance costs (in US dollars) $ 100,000      
2013 Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility maximum borrowing capacity (in US dollars)       $ 750,000,000
Borrowings under revolving credit facility (in US dollars)     0  
2013 Term Loan        
Line of Credit Facility [Line Items]        
Term Loan (in US dollars)     $ 315,000,000 $ 350,000,000
2016 Credit Agreement        
Line of Credit Facility [Line Items]        
Expiration date of revolving credit facility   Aug. 03, 2021    
Interest rate 1.77% 1.77%    
Debt issuance costs, capitalized (in US dollars) $ 3,000,000 $ 3,000,000    
2016 Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility maximum borrowing capacity (in US dollars) 900,000,000 900,000,000    
Increase in borrowing capacity (in US dollars) 1,300,000,000 1,300,000,000    
Letters of credit maximum borrowing capacity (in US dollars) 300,000,000 $ 300,000,000    
Commitment fee percentage of unused amount   0.20%    
Borrowings under revolving credit facility (in US dollars) 125,000,000 $ 125,000,000    
2016 Term Loan        
Line of Credit Facility [Line Items]        
Term Loan (in US dollars) $ 400,000,000 400,000,000    
Periodic principal payment on term loan (in US dollars)   $ 5,000,000    
Minimum [Member] | 2016 Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Commitment fee percentage of unused amount   0.15%    
Letter of credit fees 1.00% 1.00%    
Maximum [Member] | 2016 Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Commitment fee percentage of unused amount   0.30%    
Letter of credit fees 1.75% 1.75%    
Base Rate [Member] | 2016 Credit Agreement        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   0.00%    
Base Rate [Member] | Minimum [Member] | 2016 Credit Agreement        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   0.00%    
Base Rate [Member] | Maximum [Member] | 2016 Credit Agreement        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   0.75%    
Prime Rate [Member] | 2016 Credit Agreement        
Line of Credit Facility [Line Items]        
Commercial lending rate 3.50% 3.50%    
Federal Funds Rate [Member] | 2016 Credit Agreement        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   0.50%    
London Interbank Offered Rate (LIBOR) [Member] | 2016 Credit Agreement        
Line of Credit Facility [Line Items]        
Commercial lending rate 0.52% 0.52%    
Basis spread on variable rate   1.00%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | 2016 Credit Agreement        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   1.00%    
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | 2016 Credit Agreement        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   1.75%