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Debt (Tables)
 9 Months Ended
Sep. 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 due 2030
Balance Sheets:
September 30,
2013
 
December 31,
2012
Principal amount of debt component
$
28,991

 
$
83,896

Unamortized discount
(1,624
)
 
(5,769
)
Carrying amount of debt component
$
27,367

 
$
78,127

Carrying amount of equity component
$
(26,032
)
 
$
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
$
18,621

 
$
42,579

 
Three months ended September 30,
 
Nine months ended September 30,
Statements of Operations:
2013
 
2012
 
2013
 
2012
6.00% Convertible Guaranteed Notes
 
 
 
 
 
 
 
Coupon interest
$
473

 
$
1,725

 
$
1,871

 
$
5,175

Discount amortization
137

 
484

 
534

 
1,453

 
$
610

 
$
2,209

 
$
2,405

 
$
6,628