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Senior Notes, Convertible Notes, Exchangeable Notes and Trust Preferred Securities (Tables)
 12 Months Ended
Dec. 31, 2013
Debt Instrument [Line Items]  
Schedule of Long-term Debt Instruments
Below is a summary of additional disclosures related to the 6.00% Convertible Guaranteed Notes and the 5.45% Exchangeable Guaranteed Notes.
 
6.00% Convertible Guaranteed Notes
Balance Sheets:
December 31, 2013
 
December 31, 2012
Principal amount of debt component
$
28,991

 
$
83,896

Unamortized discount
(1,500
)
 
(5,769
)
Carrying amount of debt component
$
27,491

 
$
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
$
14,296

 
$
42,579

 
Statements of Operations:
 
2013
 
2012
 
2011
6.00% Convertible Guaranteed Notes
 
 
 
 
 
 
Coupon interest
 
$
2,296

 
$
6,634

 
$
6,900

Discount amortization
 
658

 
1,868

 
1,938

 
 
$
2,954

 
$
8,502

 
$
8,838

5.45% Exchangeable Guaranteed Notes
 
 

 
 

 
 

Coupon interest
 
$
—

 
$
188

 
$
3,387

Discount amortization
 
—

 
34

 
664

 
 
$
—

 
$
222

 
$
4,051
Senior Notes, Convertible Notes, Exchangeable Notes, and Trust Preferred Securities [Member]
  
Debt Instrument [Line Items]  
Schedule of Maturities of Long-term Debt
Scheduled principal payments for these debt instruments for the next five years and thereafter are as follows:

Year ending December 31,
 
Total
2014
 
$
—

2015
 
—

2016
 
—

2017(1)
 
28,991

2018
 
—

Thereafter
 
379,120

 
 
408,111

Debt discounts
 
(3,793
)
 
 
$
404,318

(1)
Although the 6.00% Convertible Guaranteed Notes mature in 2030, the notes can be put to the Company in 2017.