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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total debt $ 534,444 $ 519,597
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total debt $ 575,365 $ 565,257