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Fair Value Measurements Estimated Fair Values of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Carrying Amount
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash, restricted cash, and short-term investments (Level 1) $ 95,206 $ 34,079
Long-term debt (Level 1) 650,000 523,933
Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash, restricted cash, and short-term investments (Level 1) 95,206 34,079
Long-term debt (Level 1) $ 651,313 $ 572,625