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Long-Term Debt (Narrative) (Details) (USD $)
6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Senior Notes Due 2015 [Member]
Jun. 30, 2014
Senior Notes Due 2016 [Member]
Jun. 30, 2014
Combined Credit Agreements [Member]
Dec. 31, 2013
Combined Credit Agreements [Member]
Jun. 30, 2014
Canadian Credit Facility [Member]
Jun. 30, 2014
Combined Credit Agreements [Member]
Jun. 30, 2014
Maximum [Member]
U.S. Credit Facility [Member]
Jun. 30, 2014
Maximum [Member]
Combined Credit Agreements [Member]
Jun. 30, 2014
Maximum [Member]
Global Letter Of Credit [Member]
Jun. 30, 2014
Minimum [Member]
Jun. 30, 2014
Multiple Subsidiaries Set Two [Member]
U.S. Credit Facility [Member]
Jun. 30, 2014
London Interbank Offered Rate (LIBOR) [Member]
U.S. Credit Facility [Member]
Jun. 30, 2014
Libor [Member]
Maximum [Member]
Canadian Credit Facility [Member]
Jun. 30, 2014
Libor [Member]
Minimum [Member]
Canadian Credit Facility [Member]
Jun. 30, 2014
2013 [Member]
Senior Notes [Member]
Senior Notes Due 2015 [Member]
Jun. 30, 2014
2013 [Member]
Senior Notes [Member]
Senior Notes Due 2016 [Member]
Debt Instrument [Line Items]                                    
Percentage of ownership interest             100.00%           65.00%          
Borrowing capacity         $ 325,000,000           $ 280,000,000              
Line of Credit Facility, Maximum Borrowing Capacity         650,000,000 1,750,000,000                        
Redemption percentage of par value                                 101.938% 105.875%
Available borrowing under combined credit agreements               244,400,000                    
Commitment fee percentage               0.50% 1.75% 0.50%                
EBITDA to interest expense                       2.25            
Repayments of Long-term Debt 193,689,000 1,264,117,000 10,900,000 8,900,000                            
Issuance of debt $ 0 $ 1,173,306,000                                
Debt Instrument, Basis Spread on Variable Rate                 2.75%         1.00% 3.75% 2.75%