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Commitments and Contingencies - Legal Proceedings (Details) - item
12 Months Ended
Dec. 07, 2011
Dec. 31, 2017
Dec. 31, 2016
Series B 9.375% redeemable preferred stock      
Commitments and Contingencies      
Preferred stock, dividend rate (as a percent)   9.375% 9.375%
Series C 9.125% redeemable preferred stock      
Commitments and Contingencies      
Preferred stock, dividend rate (as a percent)   9.125% 9.125%
Curtis J. Timm | Series B and C Preferred Stock      
Commitments and Contingencies      
Preferred stock, dividend rate (as a percent) 2.00%    
Number of directors elected by Preferred holders 2    
Curtis J. Timm | Series B 9.375% redeemable preferred stock      
Commitments and Contingencies      
Preferred stock, dividend rate (as a percent) 9.375%    
Curtis J. Timm | Series C 9.125% redeemable preferred stock      
Commitments and Contingencies      
Preferred stock, dividend rate (as a percent) 9.125%