Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Carrying amounts and fair value of the financial instruments) (Details)

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Financial Instruments (Carrying amounts and fair value of the financial instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Carrying Amount    
Current and long-term debt and capital lease obligations $ 1,090,758 $ 957,663
Other liabilities 31,608 25,511
Fair Value    
Current and long-term debt and capital lease obligations 1,090,281 979,594
Other liabilities $ 30,246 $ 24,766