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Redeemable Preferred Stock (Details) (USD $)
12 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 30 Months Ended
Dec. 31, 1998
Sep. 30, 2013
Sep. 30, 2012
Jun. 11, 2013
Senior Redeemable Preferred Stock [Member]
Aug. 24, 2012
Senior Redeemable Preferred Stock [Member]
May 16, 2012
Senior Redeemable Preferred Stock [Member]
Sep. 30, 2013
Senior Redeemable Preferred Stock [Member]
Sep. 30, 2012
Senior Redeemable Preferred Stock [Member]
Sep. 30, 2013
Senior Redeemable Preferred Stock [Member]
Sep. 30, 2012
Senior Redeemable Preferred Stock [Member]
Dec. 31, 2012
Senior Redeemable Preferred Stock [Member]
May 11, 2012
Senior Redeemable Preferred Stock [Member]
Sep. 30, 2013
Senior Redeemable Preferred Stock [Member]
Toxford [Member]
Dec. 31, 2012
Senior Redeemable Preferred Stock [Member]
Porter [Member]
Sep. 30, 2013
Senior Redeemable Preferred Stock [Member]
Porter And Toxford [Member]
Dec. 31, 2012
Senior Redeemable Preferred Stock [Member]
Porter And Toxford [Member]
Sep. 30, 2013
Public Preferred Stock [Member]
Sep. 30, 2012
Public Preferred Stock [Member]
Jun. 30, 2006
Public Preferred Stock [Member]
Sep. 30, 2013
Public Preferred Stock [Member]
Sep. 30, 2012
Public Preferred Stock [Member]
Dec. 31, 2012
Public Preferred Stock [Member]
Dec. 31, 1991
Public Preferred Stock [Member]
Dec. 31, 1990
Public Preferred Stock [Member]
Jun. 30, 1995
Public Preferred Stock [Member]
Tranche
May 16, 2012
Series A-1 Preferred Stock [Member]
Sep. 30, 2013
Series A-1 Preferred Stock [Member]
Senior Redeemable Preferred Stock [Member]
Jun. 14, 2013
Series A-1 Preferred Stock [Member]
Senior Redeemable Preferred Stock [Member]
Dec. 31, 2012
Series A-1 Preferred Stock [Member]
Senior Redeemable Preferred Stock [Member]
Aug. 24, 2012
Series A-1 Preferred Stock [Member]
Senior Redeemable Preferred Stock [Member]
Sep. 30, 2013
Series A-1 Preferred Stock [Member]
Senior Redeemable Preferred Stock [Member]
Porter And Toxford [Member]
Sep. 30, 2013
Series A-2 Preferred Stock [Member]
Aug. 24, 2012
Series A-2 Preferred Stock [Member]
May 16, 2012
Series A-2 Preferred Stock [Member]
Sep. 30, 2013
Series A-2 Preferred Stock [Member]
Senior Redeemable Preferred Stock [Member]
Jun. 14, 2013
Series A-2 Preferred Stock [Member]
Senior Redeemable Preferred Stock [Member]
Dec. 31, 2012
Series A-2 Preferred Stock [Member]
Senior Redeemable Preferred Stock [Member]
Sep. 30, 2013
Class A Common Stock [Member]
Sep. 30, 2013
Class A Common Stock [Member]
Porter And Toxford [Member]
Class of Stock [Line Items]                                                                              
Preferred stock authorized (in shares)                                 6,000,000     6,000,000             1,250         1,750              
Preferred stock par value (in dollar per share)                                 $ 0.01     $ 0.01             $ 0.01         $ 0.01              
Preferred stock dividend rate per annum (in hundredths)                 14.125%                     12.00%   12.00% 6.00% 6.00%                              
Dividends Payable   $ 2,953,000 $ 3,058,000                           $ 83,500,000     $ 83,500,000   $ 80,600,000                                  
Carrying value of redeemable preferred stock       2,200,000 2,200,000 2,200,000                     115,300,000     115,300,000   112,500,000                                  
Preferred stock issued and outstanding (in shares)                                 3,185,586     3,185,586   3,185,586   2,858,723   677 197 197 433 433     607 947 276 276 607    
Senior Redeemable Preferred Stock [Abstract]                                                                              
Redeemable preferred stock liquidation value (in dollar per share)                                                     $ 1,000               $ 1,000        
Percentage of redeemable preferred stock redeemed (in hundredths)       54.50% 36.00% 26.70%                                                                  
Senior redeemable preferred stock maturity date                         Aug. 31, 2014                                                    
Maximum redemption of redeemable preferred stock   2,000,000                   4,000,000                                                      
Minimum percentage of discount on redemption of redeemable preferred stock (hundredths)                       10.00%                                                      
Redemption amount of senior redeemable preferred stock       2,000,000 2,000,000 2,000,000                                                                  
Gain on redemption of senior preferred stock       200,000 200,000 200,000                                                                  
Percentage of discount on redemption of redeemable preferred stock (in hundredths)       10.00% 10.00% 10.00%                                                                  
Common stock held by related parties (in hundredths)                                                                           39.30%  
Related party preferred stock held after redemption (in shares)                                                             163 228              
Percentage of redeemable preferred stock held by related party after redemption (in hundredths)                         76.40% 6.30% 82.70% 82.70%                                             39.30%
Undeclared unpaid dividends             1,400,000   1,400,000   3,000,000                                                        
Accrued dividends reported as interest expenses             17,000 49,000 86,000 191,000             1,000,000 1,000,000   1,900 1,900,000                                    
12% Cumulative Exchangeable Redeemable Preferred Stock [Abstract]                                                                              
Adjusted accrued accretion of public preferred stock                                     1,500,000                                        
Number of shares declared as dividend (in shares)                                             736,863 736,863                              
Number of annual tranches during the period                                                 5                            
Period during which redeemable preferred stock not callable                                       12 months                                      
Preferred stock dividend rate per annum (in dollars per share)                                       $ 1.20     $ 0.60 $ 0.6                              
Preferred stock, liquidation preference (in dollars per share)                                 $ 10     $ 10                                      
Dividends on preferred stock                                 1,000,000 1,000,000   2,900,000 2,900,000                                    
Accrued paid-in kind dividends                                                 4,000,000                            
Accrued paid-in cash dividends                                                 15,100,000                            
Redemption of public preferred stock (in shares) 410,000                                                                            
Reduced amount of Paid in kind dividends due to redemption of public preferred stock                                                 3,500,000                            
Adjusted amount of accrued cash dividends due to redemption of public preferred stock                                                 9,900,000                            
Revised accrued dividends to reflect change from Pik dividends to cash dividends                                                 $ 13,400,000