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Debt - Narrative (Details)
3 Months Ended 6 Months Ended
Aug. 03, 2020
Jul. 07, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 25, 2020
USD ($)
site
$ / shares
shares
May 06, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 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               $ 225,000,000.0 $ 0      
Deferred financing costs     $ 5,500,000     $ 5,500,000   5,500,000     $ 0  
Debt discount     $ 38,900,000     38,900,000   38,900,000     $ 0  
Loss on debt extinguishment           $ 100,000 $ 0 $ 100,000 $ 0      
Convertible Debt                        
Debt Instrument [Line Items]                        
Debt interest rate     4.125%     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   $ 6,700,000        
Debt discount     $ 38,900,000     $ 38,900,000   38,900,000        
Amortization of debt discount               (100,000)        
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%   4.125%        
Aggregate principal amount of debt       $ 225,000,000                
Deferred financing costs       $ 1,300,000                
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     $ 100,000                  
Interest expense on debt, excluding amortization of debt discount     200,000                  
Reduction of additional paid-in capital for debt transaction costs       $ 1,300,000                
Reduction to additional paid-in capital for deferred tax liability               $ 8,300,000        
Over-Allotment Option                        
Debt Instrument [Line Items]                        
Deferred financing costs     600,000     $ 600,000   600,000        
Debt discount     3,600,000     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        
Over-Allotment Option | Convertible Debt | Subsequent Event                        
Debt Instrument [Line Items]                        
Aggregate principal amount of debt   $ 20,750,000                    
Cash proceeds from debt   238,500,000                    
Deferred financing costs   $ 7,300,000               $ 100,000    
Debt discount                   $ 3,600,000    
First Amendment                        
Debt Instrument [Line Items]                        
Deferred financing costs     $ 2,800,000   $ 900,000 $ 2,800,000   $ 2,800,000        
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         6.0     6.0        
Minimum allowable interest coverage ratio               3.5        
First Amendment | Citibank, N.A. | Revolving Credit Facility | Subsequent Event                        
Debt Instrument [Line Items]                        
Maximum net leverage ratio 3.5                      
Fiscal Quarter Ending September 30, 2020 | Second Amendment [Member] | Citibank, N.A. | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Maximum net leverage ratio         6.0              
Fiscal Quarter Ending December 31, 2020 | Second Amendment [Member] | Citibank, N.A. | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Maximum net leverage ratio         6.0