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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt    
Principal $ 600,000 $ 600,000
Carrying Value 596,735 596,506
Fair Value 638,250 662,118
2017 notes
   
Debt    
Principal 300,000 300,000
Carrying Value 298,596 298,471
Fair Value 318,000 329,418
Interest rate (as a percent) 8.25% 8.25%
2019 notes
   
Debt    
Principal 300,000 300,000
Carrying Value 298,139 298,035
Fair Value $ 320,250 $ 332,700
Interest rate (as a percent) 8.50% 8.50%