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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Components of consolidated balance sheets associated with convertible senior notes
The following summarizes (in thousands) components of our consolidated balance sheets associated with our convertible senior notes:

 
As of
 
June 30, 2013
 
December 31, 2012
Face amount of 3.625% convertible senior notes
$
450

 
$
450

Face amount of 5.875% convertible senior notes
139,467

 
139,467

Discount
(44,289
)
 
(44,582
)
Net carrying value
$
95,628

 
$
95,335

Carrying amount of equity component included in additional paid-in capital
$
108,714

 
$
108,714

Excess of instruments’ if-converted values over face principal amounts
$
—

 
$
—