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Short-term Debt - 2018 Bank of America Credit Facility (Details) - USD ($)
 1 Months Ended 3 Months Ended
Apr. 30, 2018
Jun. 30, 2016
Jun. 30, 2018
Dec. 31, 2019
Oct. 31, 2019
Jun. 30, 2019
Oct. 31, 2018
Short-term Debt [Line Items]              
Short-term debt       $ 23,250,000   $ 23,647,000  
Bank of America | Bank of America 2018 Credit Agreement              
Short-term Debt [Line Items]              
Interest rate (as a percent)       3.75%   4.50%  
Revolving Credit Facility And Other Financial Accommodations | Bank of America | Line of credit | Bank of America 2018 Credit Agreement              
Short-term Debt [Line Items]              
Credit facility, maximum borrowing capacity $ 250,000,000.0            
Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement              
Short-term Debt [Line Items]              
Credit facility, maximum borrowing capacity $ 5,000,000.0       $ 15,000,000.0    
Line of credit facility, expiration period 364 days            
Line of credit facility, commitment fee amount     $ 3,200,000        
Short-term debt       $ 0   $ 1,100,000  
Credit facility, remaining borrowing capacity           $ 243,600,000  
Revolving Credit Facility | Bank of America | Standby Letters of Credit | Bank of America 2018 Credit Agreement              
Short-term Debt [Line Items]              
Credit facility, maximum borrowing capacity         6,400,000   $ 3,200,000
Line of credit facility, fair value of amount outstanding         $ 6,400,000   $ 3,200,000
Conversion Scenario One | Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement              
Short-term Debt [Line Items]              
Credit facility, maximum borrowing capacity $ 400,000,000.0            
Credit facility, term   5 years          
LIBOR | Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement              
Short-term Debt [Line Items]              
Credit facility, basis spread on variable rate (as a percent) 2.75%            
Minimum | LIBOR | Conversion Scenario One | Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement              
Short-term Debt [Line Items]              
Credit facility, basis spread on variable rate (as a percent) 1.50%            
Maximum | LIBOR | Conversion Scenario One | Revolving Credit Facility | Bank of America | Line of credit | Bank of America 2018 Credit Agreement              
Short-term Debt [Line Items]              
Credit facility, basis spread on variable rate (as a percent) 2.00%