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Long-term Debt - Principal Payments (Details) - USD ($)
Dec. 31, 2018
May 14, 2018
Jul. 31, 2017
Jun. 30, 2014
Debt Instrument [Line Items]        
Total $ 513,647,000      
Less Than 1 Year 195,141,000      
1 - 3 Years 1,584,000      
3 - 5 Years 424,000      
More Than 5 Years 316,498,000      
2019 Convertible Notes        
Debt Instrument [Line Items]        
Stated interest rate       2.125%
2024 Convertible Notes        
Debt Instrument [Line Items]        
Total     $ 143,750,000  
Stated interest rate     2.875%  
Senior Notes | 2019 Convertible Notes        
Debt Instrument [Line Items]        
Total 195,000,000      
Less Than 1 Year 195,000,000      
1 - 3 Years 0      
3 - 5 Years 0      
More Than 5 Years 0      
Senior Notes | 2024 Convertible Notes        
Debt Instrument [Line Items]        
Total 143,750,000      
Less Than 1 Year 0      
1 - 3 Years 0      
3 - 5 Years 0      
More Than 5 Years 143,750,000      
Senior Notes | 2025 Convertible Notes        
Debt Instrument [Line Items]        
Total 172,500,000 $ 172,500,000    
Less Than 1 Year 0      
1 - 3 Years 0      
3 - 5 Years 0      
More Than 5 Years 172,500,000      
Stated interest rate   2.375%    
Unsecured Debt | 8.5% unsecured notes due 2024        
Debt Instrument [Line Items]        
Total 1,237,000      
Less Than 1 Year 141,000      
1 - 3 Years 424,000      
3 - 5 Years 424,000      
More Than 5 Years $ 248,000      
Stated interest rate 8.50%      
Receivables Securitization Facility | CASHMAX secured borrowing facility        
Debt Instrument [Line Items]        
Total $ 1,160,000      
Less Than 1 Year 0      
1 - 3 Years 1,160,000      
3 - 5 Years 0      
More Than 5 Years $ 0