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Senior, Senior Subordinated, Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]  
Components of senior and senior subordinated notes
 
 
At December 31, 2013
 
At December 31, 2012
7.731% senior subordinated notes due 2017
 
$
—

 
$
99,825

4.50% senior notes due 2018
 
175,000

 
—

7.15% senior notes due 2020. At December 31, 2013 and December 31, 2012 there was approximately $3,555 in unamortized premium, net, and $3,528 in unamortized discount, respectively
 
303,555

 
196,472

7.00% senior notes due 2022
 
300,000

 
300,000

1.875% convertible senior notes due 2032
 
126,500

 
126,500

$200 million unsecured revolving credit facility
 
—

 
—

Total
 
$
905,055

 
$
722,797
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, 2013 follow (in thousands):
 
Year Ended December 31,
 
2014
$
—

2015
—

2016
—

2017
—

2018
175,000

Thereafter
730,055

Total
$
905,055