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Debt - Convertible Senior Notes (Details)
4 Months Ended 12 Months Ended
Nov. 30, 2017
USD ($)
shares
Dec. 31, 2018
USD ($)
d
quarter
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Jul. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Convertible and exchangeable senior notes   $ 616,105,000 $ 616,105,000  
Convertible senior notes | 5.00% Convertible Notes        
Debt Instrument [Line Items]        
Converted instrument, amount   $ 1,000    
Convertible and Exchangeable Senior Notes        
Debt Instrument [Line Items]        
Redemption price, percentage of principal amount   100.00%    
Threshold percentage of stock price trigger   130.00%    
Threshold trading days | d   20    
Threshold consecutive trading days | d   30    
Convertible and Exchangeable Senior Notes | 5.00% Convertible Notes        
Debt Instrument [Line Items]        
Interest Rate   5.00%    
Conversion or Exchange Price (per share of common stock) | $ / shares   $ 15.76    
Conversion or Exchange Ratio (In Shares per $1,000)   63.4700    
Conversion or Exchange Shares (in shares) | shares   12,694,000    
Convertible and exchangeable senior notes   $ 200,000,000 200,000,000  
Convertible and Exchangeable Senior Notes | 3.875% Convertible Notes        
Debt Instrument [Line Items]        
Interest Rate   3.875%    
Conversion or Exchange Price (per share of common stock) | $ / shares   $ 16.57    
Conversion or Exchange Ratio (In Shares per $1,000)   60.3431    
Conversion or Exchange Shares (in shares) | shares   24,288,000    
Convertible and exchangeable senior notes   $ 402,500,000 402,500,000  
Convertible and Exchangeable Senior Notes | 5.375% Exchangeable Notes        
Debt Instrument [Line Items]        
Interest Rate   5.375%    
Conversion or Exchange Price (per share of common stock) | $ / shares   $ 12.04    
Conversion or Exchange Ratio (In Shares per $1,000)   83.0837    
Conversion or Exchange Shares (in shares) | shares   1,130,000    
Convertible and exchangeable senior notes   $ 13,605,000 $ 13,605,000  
Converted instrument, amount $ 2,800,000      
Original debt, interest rate 5.375%      
Convertible and Exchangeable Senior Notes | 7.25% Exchangeable Notes        
Debt Instrument [Line Items]        
Interest Rate       7.25%
Repurchased face amount       $ 13,000,000
Repurchase amount       $ 13,400,000
Junior Subordinated Notes        
Debt Instrument [Line Items]        
Redemption period   5 years    
Interest payment deferral, number of consecutive quarters | quarter   6    
Class A Common Stock        
Debt Instrument [Line Items]        
Converted instrument, shares issued (in shares) | shares     233,000  
Class A Common Stock | Convertible and Exchangeable Senior Notes | 5.375% Exchangeable Notes        
Debt Instrument [Line Items]        
Converted instrument, shares issued (in shares) | shares 232,669