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Assets and Liabilities Measured at Fair Value (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial assets (liabilities), Carrying value    
Canadian government securities with maturities greater than 90 days at the date of acquisition $ 461,313us-gaap_HeldToMaturitySecuritiesCurrent $ 374,842us-gaap_HeldToMaturitySecuritiesCurrent
Current and long-term debt (3,001,626)us-gaap_DebtAndCapitalLeaseObligations (2,962,812)us-gaap_DebtAndCapitalLeaseObligations
Financial assets (liabilities):    
Canadian government securities with maturities greater than 90 days at the date of acquisition 462,056us-gaap_HeldToMaturitySecuritiesFairValue 375,623us-gaap_HeldToMaturitySecuritiesFairValue
Current and long-term debt $ (2,774,065)us-gaap_LongTermDebtFairValue $ (2,822,827)us-gaap_LongTermDebtFairValue