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Debt Facilities - Loss on debt Extinguishment (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Jul. 31, 2011
Jun. 30, 2009
Sep. 30, 2007
Debt Instrument [Line Items]                    
Loss on debt extinguishment       $ 12,276 $ 289 $ 156,990        
Conversion of 4.75% Convertible Subordinated Notes                    
Debt Instrument [Line Items]                    
Interest rate (percent) 4.75%   4.75% 4.75% 4.75% 4.75%        
3.00% convertible subordinated notes                    
Debt Instrument [Line Items]                    
Interest rate (percent) 3.00%   3.00% 3.00% 3.00% 3.00%        
Convertible Subordinated Debt | Conversion of 4.75% Convertible Subordinated Notes                    
Debt Instrument [Line Items]                    
Loss on debt extinguishment $ 289       $ 289 $ 46,973        
Interest rate (percent)                 4.75%  
Convertible Subordinated Debt | 3.00% convertible subordinated notes                    
Debt Instrument [Line Items]                    
Loss on debt extinguishment   $ 4,210       51,183        
Interest rate (percent)             3.00%     3.00%
Senior Notes | 7.00% Senior Notes due 2021                    
Debt Instrument [Line Items]                    
Loss on debt extinguishment     $ 103,273     103,273        
Interest rate (percent)               7.00%    
Redemption premium           93,965        
Write-off of unamortized debt issuance costs           9,307        
U.S. Financing | Revolving credit facility borrowings                    
Debt Instrument [Line Items]                    
Prepayment and termination fees           $ 2,534