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DEBT - Narrative (Details)
3 Months Ended 6 Months Ended
Jan. 14, 2016
USD ($)
extension_option
investment_grading_company
Jun. 30, 2017
USD ($)
extension_option
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
extension_option
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Aug. 10, 2016
USD ($)
agreement
Aug. 10, 2016
CAD
agreement
Jan. 14, 2016
CAD
extension_option
investment_grading_company
Jun. 10, 2015
CAD
Debt Instrument [Line Items]                    
Revolving credit facility   $ 32,000,000   $ 32,000,000   $ 26,000,000        
Number of investment grading companies | investment_grading_company 2               2  
Interest expense   15,862,000 $ 16,427,000 31,650,000 $ 33,345,000          
Deferred financing costs amortization included in interest expense   1,300,000 $ 1,300,000 2,558,000 $ 2,494,000          
Accrued interest   $ 13,400,000   $ 13,400,000   $ 13,800,000        
5.5% Senior Unsecured Notes due 2021 [Member]                    
Debt Instrument [Line Items]                    
Interest rate   5.50%   5.50%            
Credit Facility [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Borrowing capacity $ 1,250,000,000                  
Revolving Credit Facility [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Revolving credit facility   $ 32,000,000   $ 32,000,000            
Available borrowing capacity   $ 468,000,000   $ 468,000,000            
Interest rate   3.22%   3.22%            
5.375% Senior Unsecured Notes Due 2023 [Member]                    
Debt Instrument [Line Items]                    
Interest rate   5.375%   5.375%            
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Borrowing capacity 500,000,000.0                  
Borrowing capacity in certain foreign currencies (up to) $ 125,000,000.0                  
Number of optional extensions | extension_option 2 2   2         2  
Optional extension period 6 months     6 months            
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Annum percent unused borrowing fee       0.25%            
Facility fee, contingent event 0.125%                  
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Annum percent unused borrowing fee       0.30%            
Facility fee, contingent event 0.30%                  
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Federal Funds Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       0.50%            
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       1.00%            
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       1.80%            
Basis spread on variable rate, contingent event 0.90%                  
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       2.40%            
Basis spread on variable rate, contingent event 1.70%                  
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       0.80%            
Basis spread on variable rate, contingent event 0.00%                  
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       1.40%            
Basis spread on variable rate, contingent event 0.70%                  
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) Or Canadian Dollar Offer Rate (CDOR) [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate, contingent event 1.00%                  
Current Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) Or Canadian Dollar Offer Rate (CDOR) [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate, contingent event 1.95%                  
U.S. Dollar Term Loan [Member]                    
Debt Instrument [Line Items]                    
Debt amount $ 245,000,000.0           $ 245,000,000      
U.S. Dollar Term Loan [Member] | Interest Rate Swap [Member]                    
Debt Instrument [Line Items]                    
Interest rate swap, fixed             0.90% 0.90%    
Derivatives held | agreement             2 2    
U.S. Dollar Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.75%                  
U.S. Dollar Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 2.35%                  
U.S. Dollar Term Loan [Member] | Base Rate [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 0.75%                  
U.S. Dollar Term Loan [Member] | Base Rate [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.35%                  
U.S. Dollar Term Loan [Member] | Canadian Dollar Offer Rate (CDOR) [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 1.75%                  
U.S. Dollar Term Loan [Member] | Canadian Dollar Offer Rate (CDOR) [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate 2.35%                  
U.S. Dollar Term Loan [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate, contingent event 0.00%                  
U.S. Dollar Term Loan [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate, contingent event 0.95%                  
Prior Canadian Term Loan [Member]                    
Debt Instrument [Line Items]                    
Debt amount | CAD                   CAD 90,000,000
Interest rate swap, fixed                   1.59%
Canadian Term Loan [Member]                    
Debt Instrument [Line Items]                    
Debt amount | CAD               CAD 35,000,000 CAD 125,000,000.0  
Canadian Term Loan [Member] | Interest Rate Swap [Member]                    
Debt Instrument [Line Items]                    
Interest rate swap, fixed             0.93% 0.93%    
Derivatives held | agreement             1 1