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Equity Compensation, Employment Agreements and Other Benefit Plans (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Share based compensation      
Maximum shares authorized for grant 13,500,000    
Shares available for grant 9,500,000    
Weighted Average Exercise Price      
Options exercisable at end of year (in dollars per share) $ 10.14    
Activity and related information      
Accrued Dividends Payable $ 259,607,000 $ 86,778,000 $ 72,222,000
Expense Recognized for Equity-Based Compensation Instruments 885,000 1,101,000  
DER
     
Share based compensation      
Payments attributable to DERs 313,000 447,000  
Awards Outstanding (in shares) 1,280,898    
DERs outstanding that are attached to common stock options (in shares) 408,250    
DERS outstanding that are awarded in connection with or attached to RSU (in shares) 872,648    
Average forfeiture rate on DERs outstanding attached to RSUs (as a percent) 18.20%    
Average forfeiture rate on DERs outstanding, other than attached to RSUs 0.00%    
Weighted average period over which DERs are scheduled to elapse 1 year 9 months 18 days    
Activity and related information      
Expense Recognized for Equity-Based Compensation Instruments 51,000 59,000  
Stock options
     
Share based compensation      
Maximum grant date market value of the common stock to be received upon exercise of options in one calendar year 100,000    
Exercise price of an ISO relative to fair market value on the grant date, minimum (as a percent) 100.00%    
Exercise price of an ISO granted to a 10% stockholder relative to fair market value on the grant date, minimum (as a percent) 110.00%    
Percentage of stockholders to whom 110% of ISO is granted 10.00%    
Maximum period for exercise of stock options 10 years    
Stock options cancelled (in shares) 0 50,000  
Stock options activity      
Stock Options, outstanding (in shares) 427,000    
Weighted Average Exercise Price      
Aggregate intrinsic value of total stock options Outstanding 23,000    
Activity and related information      
Period to determine market value of the common stock to qualify as an incentive stock option for tax purposes 1 year    
Restricted Stock
     
Activity and related information      
Granted (in shares) 12,331 14,881  
Unrecognized compensation cost 3,300,000   3,700,000
Accrued Dividends Payable 510,000   428,000
Period for recognizing unrecognized compensation cost 1 year 4 months 24 days    
Expense Recognized for Equity-Based Compensation Instruments 544,000 762,000  
Restricted Stock Units
     
Activity and related information      
Unrecognized compensation cost 2,300,000   2,600,000
Period for recognizing unrecognized compensation cost 2 years 2 months 12 days    
Weighted average forfeiture rate of unvested RSUs (as a percent) 15.90%    
Expense Recognized for Equity-Based Compensation Instruments $ 290,000 $ 280,000  
2010 Equity Compensation Plan
     
Share based compensation      
Maximum number of common shares that can be granted to participant in any one year 1,500,000    
Period during which a participant can be awarded the maximum number of shares allowable under the Plan 1 year    
Maximum percentage of common shares that can be owned or deemed to be owned by a participant 9.80%