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Debt And Other Long-Term Liabilities (Schedule Of Debt And Other Long-Term Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Long-term Debt, by Type Alternative [Abstract]    
Senior unsecured notes, current $ 0  
Senior unsecured notes, long-term 350,000  
Senior unsecured notes, total 350,000  
Callable convertible debt, current 51,625 0
Convertible debt, long-term 0 172,810
Convertible debt, total 51,625 172,810
Revolving line of credit under credit facility, current 0  
Revolving line of credit under credit facility, noncurrent 100,000  
Revolving line of credit under credit facility, total 100,000  
Term loan under credit facility, current 18,594 15,312
Term loan under credit facility, long-term 130,156 144,375
Term loan under credit facility, total 148,750 159,687
Asset retirement obligation, current 0 0
Asset retirement obligations, long-term 12,689 14,020
Asset retirement obligation, total 12,689 14,020
Other liabilities, current 5 217
Other liabilities, long-term 12,848 9,974
Other liabilities, total 12,853 10,191
Debt and other liabilities, current 70,224 15,529
Debt and other liabilities, long-term 605,693 341,179
Total debt and other liabilities $ 675,917 $ 356,708