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Schedule of Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Debt Instrument    
Total senior notes $ 604,050 $ 601,329
Total credit facilities 34,750 75,250
PDCM second lien term loan 15,000 0
Total Debt 653,800 676,579
Current portion of long-term debt 104,050 0
Long-term debt 549,750 676,579
3.25% Convertible Senior Notes due 2016
   
Debt Instrument    
Principal amount 115,000 115,000
Unamortized discount (10,950) (13,671)
3.25% Convertible senior notes due 2016, net of discount 104,050 101,329
7.75% Senior Notes due 2022
   
Debt Instrument    
Senior Notes 500,000 500,000
Revolving Credit Facility
   
Debt Instrument    
Corporate Line of Credit Outstanding 0 49,000
PDCM Credit Facility
   
Debt Instrument    
PDCM Line of Credit Outstanding $ 34,750 $ 26,250