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Equity Compensation, Employment Agreements and Other Benefit Plans (Details) - USD ($)
12 Months Ended 48 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share based compensation              
Maximum shares authorized for grant (in shares)         12,000,000    
Shares available for grant         8,200,000    
Weighted Average Exercise Price              
Accrued Dividends Payable         $ 74,657,000 $ 74,575,000 $ 74,529,000
Fair value assumptions              
Expense related to equity-based compensation instruments $ 9,162,000 $ 7,832,000 $ 8,585,000        
DER              
Share based compensation              
Payments attributable to DERs $ 5,000 $ 16,000 $ 69,000        
Number of shares outstanding (in shares) 8,215 24,402 218,225 0 0 8,215 24,402
Activity and related information              
Outstanding at beginning of year (in shares) 8,215 24,402 218,225        
Granted (in shares) 0 0 0        
Cancelled, forfeited or expired (in shares) (8,215) (16,187) (193,823)        
Outstanding at end of year (in shares) 0 8,215 24,402 0      
Weighted Average Grant Date Fair Value              
Granted (in dollars per share) $ 2.77            
Fair value assumptions              
Weighted average volatility estimated (as a percent) 31.00%            
Expected term 6 years            
Weighted average risk-free rate (as a percent) 2.23%            
Estimated annual dividend yield (as a percent) 13.00%            
Expense related to equity-based compensation instruments $ 44,000 $ 82,000 $ 146,000        
Stock options              
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            
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            
Aggregate intrinsic value of total stock options Outstanding         $ 0    
Stock options activity              
Outstanding at beginning of year (in shares)   0 5,000        
Granted (in shares)     0 0      
Cancelled, forfeited or expired (in shares)     (5,000)        
Exercised (in shares)     0        
Outstanding at end of year (in shares)     0        
Options exercisable at end of year (in shares)     0        
Weighted Average Exercise Price              
Outstanding at beginning of year (in dollars per share)   $ 0.00 $ 8.40        
Granted (in dollars per share)     0.00        
Cancelled, forfeited or expired (in dollars per share)     8.40        
Exercised (in dollars per share)     0.00        
Outstanding at end of year (in dollars per share)     $ 0.00        
Options exercisable at end of year (in dollars per share)             $ 0.00
Restricted Stock              
Share based compensation              
Number of shares outstanding (in shares) 110,920 243,948 443,967 28,968 28,968 110,920 243,948
Activity and related information              
Outstanding at beginning of year (in shares) 110,920 243,948 443,967        
Granted (in shares) 487,216 497,007 491,797        
Vested (in shares) (567,851) (629,212) (690,397)        
Cancelled, forfeited or expired (in shares) (1,317) (823) (1,419)        
Outstanding at end of year (in shares) 28,968 110,920 243,948 28,968      
Weighted Average Exercise Price              
Unrecognized compensation cost         $ 203,000 $ 807,000  
Accrued Dividends Payable         $ 55,000 $ 193,000  
Total fair value of stock vested $ 4,300,000 $ 4,300,000 $ 5,700,000        
Period for recognizing unrecognized compensation cost 1 year            
Weighted Average Grant Date Fair Value              
Outstanding at beginning of year (in dollars per share) $ 7.41 $ 7.48 $ 7.50        
Granted (in dollars per share) 7.66 6.83 8.29        
Vested (in dollars per share) 7.64 6.98 8.07        
Cancelled/forfeited (in dollars per share) 7.12 7.74 7.58        
Outstanding at end of year (in dollars per share) $ 7.12 $ 7.41 $ 7.48 $ 7.12      
Fair value assumptions              
Expense related to equity-based compensation instruments $ 4,326,000 $ 4,373,000 $ 5,553,000        
Restricted Stock Units              
Share based compensation              
Number of shares outstanding (in shares) 1,875,730 1,218,474 777,818 2,058,099 2,058,099 1,875,730 1,218,474
Activity and related information              
Outstanding at beginning of year (in shares) 1,875,730 1,218,474 777,818        
Granted (in shares) 728,195 682,054 630,815        
Settled (in shares) (535,826) (17,298) (87,338)        
Cancelled, forfeited or expired (in shares) (10,000) (7,500) (102,821)        
Outstanding at end of year (in shares) 2,058,099 1,875,730 1,218,474 2,058,099      
Vested but not settled at end of year (in shares)         911,318 729,523 643,138
Unvested at end of period (in shares)         1,146,781 1,146,207 575,336
Weighted Average Exercise Price              
Unrecognized compensation cost         $ 3,600,000 $ 4,000,000  
Period for recognizing unrecognized compensation cost 1 year 7 months 21 days            
Weighted average forfeiture rate of unvested RSUs (as a percent) 0.00%            
Weighted Average Grant Date Fair Value              
Outstanding at beginning of year (in dollars per share) $ 6.90 $ 6.84 $ 6.48        
Granted (in dollars per share) 5.96 7.01 6.64        
Settled (in dollars per share) 6.92 6.60 6.86        
Cancelled/forfeited (in dollars per share) 6.29 6.85 2.90        
Outstanding at end of year (in dollars per share) $ 6.57 $ 6.90 $ 6.84 $ 6.57      
Vested but not settled at end of year (in dollars per share)         $ 6.93 $ 7.20 $ 7.10
Unvested at end of year (in dollars per share)         $ 6.28 $ 6.71 $ 6.54
Fair value assumptions              
Expense related to equity-based compensation instruments $ 4,792,000 $ 3,377,000 $ 2,886,000        
Restricted Stock Units | Chief Executive Officer              
Fair value assumptions              
Expense related to equity-based compensation instruments     $ 500,000        
RSUs With Service Condition              
Share based compensation              
Number of shares outstanding (in shares) 1,138,930 769,174 490,099 1,194,299 1,194,299 1,138,930 769,174
Activity and related information              
Outstanding at beginning of year (in shares) 1,138,930 769,174 490,099        
Granted (in shares) 420,695 390,804 357,015        
Settled (in shares) (360,326) (17,298) (72,873)        
Cancelled, forfeited or expired (in shares) (5,000) (3,750) (5,067)        
Outstanding at end of year (in shares) 1,194,299 1,138,930 769,174 1,194,299      
Vested but not settled at end of year (in shares)         617,518 554,023 467,638
Unvested at end of period (in shares)         576,781 584,907 301,536
Weighted Average Grant Date Fair Value              
Outstanding at beginning of year (in dollars per share) $ 7.71 $ 7.55 $ 7.75        
Granted (in dollars per share) 6.81 7.96 7.22        
Settled (in dollars per share) 7.75 6.60 7.28        
Cancelled/forfeited (in dollars per share) 7.32 7.97 7.36        
Outstanding at end of year (in dollars per share) $ 7.38 $ 7.71 $ 7.55 $ 7.38      
Vested but not settled at end of year (in dollars per share)         $ 7.45 $ 7.83 $ 7.81
Unvested at end of year (in dollars per share)         $ 7.30 $ 7.59 $ 7.15
RSUs With Market and Service Conditions              
Share based compensation              
Number of shares outstanding (in shares) 736,800 449,300 287,719 863,800 863,800 736,800 449,300
Activity and related information              
Outstanding at beginning of year (in shares) 736,800 449,300 287,719        
Granted (in shares) 307,500 291,250 273,800        
Settled (in shares) (175,500) 0 (14,465)        
Cancelled, forfeited or expired (in shares) (5,000) (3,750) (97,754)        
Outstanding at end of year (in shares) 863,800 736,800 449,300 863,800      
Vested but not settled at end of year (in shares)         293,800 175,500 175,500
Unvested at end of period (in shares)         570,000 561,300 273,800
Weighted Average Grant Date Fair Value              
Outstanding at beginning of year (in dollars per share) $ 5.66 $ 5.61 $ 4.32        
Granted (in dollars per share) 4.81 5.73 5.87        
Settled (in dollars per share) 5.21 0.00 4.71        
Cancelled/forfeited (in dollars per share) 5.27 5.73 2.67        
Outstanding at end of year (in dollars per share) $ 5.45 $ 5.66 $ 5.61 $ 5.45      
Vested but not settled at end of year (in dollars per share)         $ 5.83 $ 5.21 $ 5.21
Unvested at end of year (in dollars per share)         5.25 5.80 5.87
RSUs with Service Condition and both Service and Market Conditions              
Activity and related information              
Granted (in shares) 615,000 582,500 547,600        
Fair value assumptions              
Weighted average volatility estimated (as a percent) 17.00% 18.00% 22.00%        
Expected term 3 years 3 years 3 years        
Weighted average risk-free rate (as a percent) 1.20% 0.90% 0.73%        
Estimated annual dividend yield (as a percent) 11.00% 9.00% 8.00%        
RSUs with Service Condition, weighted average grant date fair value based on share closing price              
Activity and related information              
Granted (in shares) 113,195 99,554 83,215        
Fair value assumptions              
Common stock, closing price (in dollars per share)         $ 7.20    
RSUs with Service Condition, weighted average grant date fair value based on share closing price | Minimum              
Fair value assumptions              
Common stock, closing price (in dollars per share)           7.93 7.19
RSUs with Service Condition, weighted average grant date fair value based on share closing price | Maximum              
Fair value assumptions              
Common stock, closing price (in dollars per share)           $ 7.97 $ 8.16
Equity Compensation Plan              
Share based compensation              
Maximum number of common shares that can be granted to participant in any one year (in shares) 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 (more than) 9.80%