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Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
May. 15, 2015
May. 14, 2015
Mar. 31, 2014
Mar. 30, 2014
Apr. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Debt Instrument [Line Items]                    
Dividends paid to common stockholders   $ 145,000,000             $ 144,600,000 $ 0
Gain (loss) on debt extinguishment             $ (22,200,000) $ (2,900,000) (22,200,000) (3,400,000)
Write-off of deferred financing costs and debt discount                 8,400,000 $ 1,800,000
Deferred financing costs capitalized                 5,200,000  
Loss on debt extinguishment [Member]                    
Debt Instrument [Line Items]                    
Gain (loss) on debt extinguishment                 (18,600,000)  
Senior Notes [Member] | 8.375% senior secured notes due 2019 [Member]                    
Debt Instrument [Line Items]                    
Repayments of senior notes   $ 220,000,000                
Interest rate   8.375%                
Redemption price   106.281%                
Premium paid on debt redemption                 13,800,000  
Redemption of senior notes           $ 55,000,000        
Senior Notes [Member] | 8.375% senior secured notes due 2019 [Member] | Loss on debt extinguishment [Member]                    
Debt Instrument [Line Items]                    
Gain (loss) on debt extinguishment           $ (2,900,000)        
Senior Secured Notes and Line of Credit [Member] | 8.375% senior secured notes due 2019 and senior secured term loan facility due March 2020 [Member] | Loss on debt extinguishment [Member]                    
Debt Instrument [Line Items]                    
Write-off of deferred financing costs and debt discount                 4,800,000  
Secured Debt [Member] | Line of Credit [Member] | Senior secured term loan facility due September 2020 [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity     $ 730,000,000.0              
Repayments of credit facility $ 248,000,000                  
Secured Debt [Member] | Line of Credit [Member] | Senior secured term loan facility due September 2020 [Member] | Loss on debt extinguishment [Member]                    
Debt Instrument [Line Items]                    
Write-off of deferred financing costs and debt discount                 $ 3,600,000  
Secured Debt [Member] | Line of Credit [Member] | Senior secured term loan facility due March 2020 [Member]                    
Debt Instrument [Line Items]                    
Repayments of credit facility     $ 339,100,000              
Borrowing - term loan       $ 100,000,000            
Discount - term loan       $ 500,000            
Margin on interest rate       3.00% 3.25%