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Long Term Debt - Senior Notes, Capped Call Transaction and Interest Expense (Details)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2020
USD ($)
d
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
May 01, 2019
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]              
Repayment of credit facility $ 439,900,000            
Interest expense, net   $ (11,336,000) $ (5,988,000) $ (17,296,000) $ (10,226,000)    
1.50% Convertible Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal $ 500,000,000.0            
Stated interest rate, percentage 1.50%            
Proceeds from debt offering $ 488,800,000            
Payment of cap call transaction $ 47,900,000            
Initial conversion rate 0.1018589            
Debt conversion price (in usd per share) | $ / shares $ 9.82            
Trading days (whether or not consecutive) | d 20            
Consecutive trading days | d 30            
Percentage of stock price 130.00%            
Business period 5 days            
Measurement period 5 days            
Measurement period, percentage 98.00%            
Redemption price, percentage of principal repurchased 100.00%            
Cap call transaction cap price per share (in usd per share) | $ / shares           $ 13.4750  
Premium over last reported sale price, percentage 75.00%            
Deferred financing costs   $ 9,611,000 $ 0 $ 9,611,000 $ 0 $ 9,700,000  
Effective interest rate,percentage   7.00%   7.00%      
Deferred tax liability, net $ 12,100,000            
Decrease in valuation allowance $ 12,100,000            
1.50% Convertible Senior Notes | Additional Paid-in-Capital              
Debt Instrument [Line Items]              
Deferred financing costs           2,300,000  
1.50% Convertible Senior Notes | Senior Notes              
Debt Instrument [Line Items]              
Deferred financing costs           $ 12,000,000.0  
3.250% Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal             $ 600,000,000.0
3.250% Senior Notes | Senior Notes              
Debt Instrument [Line Items]              
Stated interest rate, percentage   3.25%   3.25%     3.25%
Deferred financing costs             $ 5,300,000