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Debt Obligations (Details 9) (USD $)
1 Months Ended
Oct. 31, 2014
CDO I debt
Jul. 31, 2014
CDO I debt
Apr. 30, 2014
CDO I debt
Jan. 31, 2014
CDO I debt
Oct. 31, 2013
CDO I debt
Oct. 31, 2014
CDO II debt
Jul. 31, 2014
CDO II debt
Apr. 30, 2014
CDO II debt
Jan. 31, 2014
CDO II debt
Oct. 31, 2013
CDO II debt
Oct. 31, 2014
CDO III debt
Jul. 31, 2014
CDO III debt
Apr. 30, 2014
CDO III debt
Jan. 31, 2014
CDO III debt
Oct. 31, 2013
CDO III debt
Oct. 31, 2014
CLO I
Jul. 31, 2014
CLO I
Apr. 30, 2014
CLO I
Jan. 31, 2014
CLO I
Oct. 31, 2013
CLO I
Oct. 31, 2014
CLO II
Jul. 31, 2014
CLO II
Apr. 30, 2014
CLO II
Jan. 31, 2014
CLO II
Oct. 31, 2013
CLO II
Oct. 31, 2014
CLO III
Jul. 31, 2014
CLO III
Sep. 30, 2014
Junior subordinated notes
Debt Covenants                                                        
Current overcollateralization ratio for cash flow triggers (as a percent) 173.33% 171.01% 184.35% 167.15% 166.88% 161.20% 153.44% 138.15% 137.87% 133.77% 110.65% 109.20% 108.74% 107.80% 106.64% 142.96% 142.96% 142.96% 142.96% 142.96% 146.89% 146.89% 146.89% 146.89% 146.89% 133.33% 133.33%  
Limit overcollateralization ratio for cash flow triggers (as a percent) 145.00%         127.30%         105.60%         137.86%         144.25%         132.33%    
Current interest coverage ratio for cash flow triggers (as a percent) 631.39%         397.36%         1083.81%         213.63%         298.52%         288.49%    
Limit interest coverage ratio for cash flow triggers (as a percent) 160.00%         147.30%         105.60%         120.00%         120.00%         120.00%    
Amount payable on default of senior debt                                                       $ 0