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Debt Debt (Tables)
 6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Below is a summary of additional disclosures related to the 6.00% Convertible Guaranteed Notes due 2030.
 
6.00% Convertible Guaranteed Notes
Balance Sheets:
June 30,
2013
 
December 31,
2012
Principal amount of debt component
$
41,146

 
$
83,896

Unamortized discount
(2,480
)
 
(5,769
)
Carrying amount of debt component
$
38,666

 
$
78,127

Carrying amount of equity component
$
(16,677
)
 
$
3,654

Effective interest rate
8.1
%
 
8.1
%
Period through which discount is being amortized, put date
01/2017

 
01/2017

Aggregate if-converted value in excess of aggregate principal amount
$
29,135

 
$
42,579

 
Three months ended June 30,
 
Six months ended June 30,
Statements of Operations:
2013
 
2012
 
2013
 
2012
6.00% Convertible Guaranteed Notes
 
 
 
 
 
 
 
Coupon interest
$
610

 
$
1,725

 
$
1,398

 
$
3,450

Discount amortization
175

 
484

 
398

 
969

 
$
785

 
$
2,209

 
$
1,796

 
$
4,419