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Debt - 6.875% Senior Secured Notes (Details) - USD ($)
3 Months Ended
Mar. 13, 2015
Mar. 10, 2015
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Pretax gain from repurchase of debt     $ 0 $ 3,676,000  
Accelerated amortization of debt issuance costs     $ 795,000 $ 821,000  
Senior Secured Notes | 6.875% Senior Secured Notes          
Debt Instrument [Line Items]          
Interest rate (percent)   6.875% 6.875% 6.875% 6.875%
Aggregate principal amount     $ 465,000,000    
Issuance of debt, percentage   98.962%      
Proceeds from issuance of debt, net   $ 494,800,000      
Yield to maturity, percentage   7.083%     7.59%
Percentage in voting equity interests of controlled foreign subsidiaries 66.00%        
Redemption period   12 months      
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 | 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%