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Senior, Senior Subordinated, Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2012
Debt Disclosure [Abstract]  
Components of senior and senior subordinated notes
 
 
At December 31, 2012
 
At December 31, 2011
6.25% senior notes due 2015. At December 31, 2011, there was approximately $451 in unamortized discount
 
$
—

 
$
284,549

7.731% senior subordinated notes due 2017
 
99,825

 
125,875

7.15% senior notes due 2020. At December 31, 2012 and 2011, there was approximately $3,528 and $4,015 in unamortized discount, respectively
 
196,472

 
195,985

7.00% senior notes due 2022
 
300,000

 
—

1.875% convertible senior notes due 2032
 
126,500

 
—

$125 million unsecured revolving credit facility
 
—

 
—

Total
 
$
722,797

 
$
606,409
Scheduled principal maturities of senior, senior subordinated and convertible notes
Scheduled principal maturities of our senior, senior subordinated and convertible notes as of December 31, 2012 follow (in thousands):
 
Year Ended December 31,
 
2013
$
—

2014
—

2015
—

2016
—

2017
99,825

Thereafter
626,500

Total
$
726,325