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Carrying Amounts and Fair Values of Financial Instruments for Which the Fair Value Option Was Not Elected (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Option, Disclosures Related to Election, Items Existing at Effective Date [Line Items]        
Cash and Cash Equivalents $ 225,563 $ 327,420 $ 21,064 $ 21,862
Long-term debt (3,239,730) (3,118,920)    
Carrying Amount
       
Fair Value, Option, Disclosures Related to Election, Items Existing at Effective Date [Line Items]        
Cash and Cash Equivalents 225,563 327,420    
Long-term debt (3,239,730) (3,118,920)    
Estimate of Fair Value Measurement [Member]
       
Fair Value, Option, Disclosures Related to Election, Items Existing at Effective Date [Line Items]        
Cash and Cash Equivalents 225,563 327,420    
Long-term debt $ (3,269,768) $ (3,299,875)