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Debt and Credit Facility Availability and Usage of Revolving Credit Facility (Details) - Revolving Credit Facility
Mar. 31, 2020
USD ($)
Line of Credit  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 375,000,000.0
Line of Credit Facility, Current Borrowing Capacity 349,200,000
Long-term Line of Credit 0
Line of Credit Facility, Remaining Borrowing Capacity $ 341,500,000
Line of Credit Facility, Interest Rate at Period End 3.50%
Letter of Credit  
Line of Credit Facility [Line Items]  
Long-term Line of Credit $ (7,700,000)