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Debt (Tables)
 3 Months Ended
Mar. 31, 2014
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:
March 31,
2014
 
December 31,
2013
Principal amount of debt component
$
26,186

 
$
28,991

Unamortized discount
(1,244
)
 
(1,500
)
Carrying amount of debt component
$
24,942

 
$
27,491

Carrying amount of equity component
$
(27,564
)
 
$
(26,032
)
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
$
16,045

 
$
14,296

 
Three months ended March 31,
Statements of Operations:
2014
 
2013
6.00% Convertible Guaranteed Notes
 
 
 
Coupon interest
$
428

 
$
788

Discount amortization
121

 
223

 
$
549

 
$
1,011