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Debt - Narrative (Details)
3 Months Ended 9 Months Ended
Aug. 03, 2020
Jul. 07, 2020
USD ($)
Jun. 25, 2020
USD ($)
site
$ / shares
shares
May 06, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Aug. 06, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 28, 2018
USD ($)
Debt Instrument [Line Items]                      
Over-allotment option term     13 days                
Cash proceeds from debt             $ 245,700,000 $ 0      
Debt discount         $ 46,700,000   46,700,000     $ 0  
Interest expense capitalized             8,100,000        
Loss on debt extinguishment         $ 0 $ 0 $ 100,000 $ 0      
Convertible Debt                      
Debt Instrument [Line Items]                      
Debt interest rate         4.125%   4.125%        
Citibank, N.A. | Letter of Credit                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity                     $ 50,000,000
Citibank, N.A. | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity                     400,000,000
Credit facility optional increase limit                     $ 600,000,000
Convertible Senior Notes Due 2025                      
Debt Instrument [Line Items]                      
Deferred financing costs         $ 6,700,000   $ 6,700,000        
Interest expense on debt, excluding amortization of debt discount             $ 39,000,000.0        
Convertible Senior Notes Due 2025 | Convertible Debt                      
Debt Instrument [Line Items]                      
Debt interest rate         4.125%   4.125%        
Aggregate principal amount of debt     $ 225,000,000                
Deferred financing costs     $ 1,400,000                
Converted instrument, shares issued (in shares) | shares     0.1144885                
Conversion price (in dollars per share) | $ / shares     $ 8.73                
Threshold percentage of stock price trigger     130.00%                
Threshold trading days | site     20                
Threshold consecutive trading days | site     30                
Redemption price, percentage     100.00%                
Number of consecutive business days following consecutive trading day period     5 days                
Period of consecutive trading days     5 days                
Trading price as a percentage of closing price of common stock     98.00%                
Increase in additional paid-in capital for debt discount     $ 42,600,000                
Debt discount     $ 42,600,000                
Effective interest rate     8.35%                
Term of debt     5 years                
Amortization of debt discount and transaction costs         $ 2,000,000.0   $ 2,100,000        
Interest expense capitalized         0   100,000        
Interest expense on debt, excluding amortization of debt discount         2,500,000   2,700,000        
Reduction of additional paid-in capital for debt transaction costs     $ 1,400,000                
Reduction to additional paid-in capital for deferred tax liability             9,100,000        
Over-Allotment Option                      
Debt Instrument [Line Items]                      
Deferred financing costs         900,000   900,000        
Debt discount         3,600,000   3,600,000        
Over-Allotment Option | Convertible Debt                      
Debt Instrument [Line Items]                      
Aggregate principal amount of debt   $ 20,750,000 $ 33,750,000   20,750,000   20,750,000        
Cash proceeds from debt   238,200,000                  
Deferred financing costs   $ 7,600,000             $ 200,000    
Debt discount                 $ 3,600,000    
First Amendment                      
Debt Instrument [Line Items]                      
Deferred financing costs       $ 900,000 $ 2,600,000   $ 2,600,000        
Maximum unsecured indebtedness       350,000,000              
Loss on debt extinguishment       $ 100,000              
Increase on applicable margin       25.00%              
First Amendment | Citibank, N.A. | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity       $ 325,000,000              
Maximum net leverage ratio 3.5     6.0     3.5        
Minimum allowable interest coverage ratio             3.5        
Fiscal Quarter Ending September 30, 2020 | Second Amendment | Citibank, N.A. | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Maximum net leverage ratio       6.0              
Fiscal Quarter Ending December 31, 2020 | Second Amendment | Citibank, N.A. | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Maximum net leverage ratio       6.0