Quarterly report pursuant to Section 13 or 15(d)

Debt (Conv) (Details)

v3.5.0.2
Debt (Conv) (Details)
$ / shares in Units, $ in Thousands
Dec. 15, 2014
USD ($)
item
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Nov. 19, 2015
USD ($)
Convertible Notes        
Debt        
Face amount $ 172,500      
Net proceeds from offering $ 166,967      
Interest rate (as a percent) 1.75%      
Repurchase percentage of principal (as a percent) 100.00%      
Conversion rate 0.0159022      
Principal amount | $ / shares $ 1      
Conversion price (in dollars per share) | $ / shares $ 62.88 $ 62.88    
Threshold trading days (in days) | item 20      
Consecutive trading days 30 days      
Threshold percentage of stock price trigger (as a percent) 130.00%      
Threshold business days 5 days      
Threshold consecutive trading-day period 5 days      
Threshold percentage of trading price trigger (as a percent) 98.00%      
Allocated to equity components $ 26,618      
Offering costs 882      
Discount $ 27,500 $ 19,790 $ 22,367  
Effective interest rate on the liability component (as a percent)   6.10%    
Term Notes        
Debt        
Face amount       $ 160,000