XML 127 R31.htm IDEA: XBRL DOCUMENT v3.5.0.2
Debt - 2016 Convertible Notes (Details Textual)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
Tradingday
$ / shares
Jun. 30, 2015
USD ($)
Apr. 08, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 15, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]            
Proceeds from long-term debt $ 230,000 $ 150,000        
Aggregate principal amount of convertible notes repurchased     $ 106,000      
Amount paid to purchase aggregate principal amount     $ 198,400      
Long-term debt, unamortized original issue discount $ 25,322         $ 4,738
Senior Convertible Notes 2016            
Debt Instrument [Line Items]            
Senior convertible notes face amount       $ 230,000    
Interest rate on senior convertible notes 4.25%     4.25%    
Maturity date of 2016 convertible Notes Mar. 15, 2036          
Initial conversion rate of common stock 17.4642          
Convertible Notes, initial conversion of Par Value Convertible Notes to common stock $ 1          
Initial conversion price | $ / shares $ 57.26          
Percentage of par value of convertible notes to be settled in cash 100.00%          
Rate of conversion price 130.00%          
Debt instrument, convertible, threshold consecutive trading days 20 days          
Debt instrument, convertible, threshold trading days | Tradingday 30          
Proceeds from long-term debt $ 223,000          
Long-term debt, unamortized original issue discount $ 15,212       $ 15,900  
Effective interest rate of the liability 5.63%