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Equity Compensation, Employment Agreements and Other Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Share based compensation          
Maximum shares authorized for grant 12,000,000.0   12,000,000.0    
Shares available for grant (in shares) 8,600,000   8,600,000    
Accrued dividends payable $ 74,556 $ 74,560 $ 74,556 $ 74,560 $ 74,575
Expense recognized for equity-based compensation instruments 1,101 1,031 4,143 3,600  
Dividend Equivalents          
Share based compensation          
Payments attributable to dividend equivalent rights $ 2 5 $ 5 15  
Share-based awards outstanding (in shares) 0   0    
Expense recognized for equity-based compensation instruments $ 0 20 $ 44 $ 61  
Stock options          
Share based compensation          
Stock options, grants in period (in shares)     0 0  
Stock options, outstanding (in shares) 0   0    
Restricted shares of common stock          
Share based compensation          
Awards granted (in shares)     0 12,611  
Unrecognized compensation cost $ 349   $ 349   807
Accrued dividends payable 98   $ 98   193
Period for recognizing unrecognized compensation cost     1 year    
Expense recognized for equity-based compensation instruments $ 153 $ 247 $ 457 $ 841  
RSUs          
Share based compensation          
Awards granted (in shares) 0 0 728,195 682,054  
Unrecognized compensation cost $ 4,600   $ 4,600   $ 4,000
Period for recognizing unrecognized compensation cost     1 year 9 months 4 days    
Forfeitures (in shares)   7,500 10,000 7,500  
Forfeiture rate     0.00%    
Expense recognized for equity-based compensation instruments $ 948 $ 764 $ 3,642 $ 2,698  
Equity Compensation Plan          
Share based compensation          
Maximum number of common shares that can be granted to participant in any one year     1,500,000.0    
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 (more than)     9.80%