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Debt - 6.875% Senior Secured Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 13, 2015
Mar. 10, 2015
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Debt Instrument [Line Items]                
Pretax gain from repurchase of debt           $ 3,676,000 $ 0  
Accelerated amortization of debt issuance costs     $ 795,000   $ 841,000 $ 2,411,000 2,697,000  
Other Assets | Related Parties                
Debt Instrument [Line Items]                
Deferred debt costs         $ 11,300,000   $ 11,300,000  
Senior Secured Notes | 6.875% Senior Secured Notes                
Debt Instrument [Line Items]                
Interest rate (percent) 6.875% 6.875% 6.875%   6.875% 6.875% 6.875% 6.875%
Issuance of debt, percentage   98.962%            
Proceeds from issuance of debt, net   $ 494,800,000            
Yield to maturity, percentage   7.083% 7.59%     7.59%    
Percentage in voting equity interests of controlled foreign subsidiaries 66.00%              
Redemption period   12 months            
Redemption price percentage   106.875%            
Repurchase of debt, par value amount       $ 35,000,000.0        
Repurchase of debt       31,200,000        
Accelerated original issue discount       300,000        
Accelerated amortization of debt issuance costs       700,000        
Senior Secured Notes | 6.875% Senior Secured Notes | Investment Income and Other, Net                
Debt Instrument [Line Items]                
Pretax gain from repurchase of debt       $ 3,700,000        
Senior Secured Notes | 6.875% Senior Secured Notes | Related Parties                
Debt Instrument [Line Items]                
Payment of issuance costs to related party   $ 11,300,000            
Senior Secured Notes | 6.875% Senior Secured Notes | Other Assets                
Debt Instrument [Line Items]                
Deferred debt costs   $ 12,600,000            
Senior Secured Notes | 6.875% Senior Secured Notes | Prior to March 15, 2017                
Debt Instrument [Line Items]                
Redemption price percentage   100.00%            
Maximum redemption percentage of principal amount   40.00%            
Senior Secured Notes | 6.875% Senior Secured Notes | Minimum                
Debt Instrument [Line Items]                
Redemption notice, period   30 days            
Senior Secured Notes | 6.875% Senior Secured Notes | Maximum                
Debt Instrument [Line Items]                
Redemption notice, period   60 days            
Senior Secured Notes | 6.875% Senior Secured Notes | Jefferies LLC                
Debt Instrument [Line Items]                
Interest rate (percent)   6.875%            
Aggregate principal amount   $ 500,000,000            
Senior Secured Notes | 6.875% Indenture                
Debt Instrument [Line Items]                
Interest rate (percent) 6.875%