Debt - Credit Facility with a Lending Consortium Arranged by SunTrust (Details) - Truist - Revolving credit facility with Truist	Oct. 01, 2019 USD ($)	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Total net debt ratio, maximum	3.00
Long-term debt, threshold for EBITDA ratio increase election	$ 50,000,000
Total net debt ratio, maximum after increase election	3.50
Total net debt ratio, minimum	1.50
Minimum
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.25%
Maximum
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.45%
Third Amended Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 350,000,000
Long-term debt, gross		$ 0
Base Rate | Minimum
Debt Instrument [Line Items]
Interest rate margin	0.50%
Base Rate | Maximum
Debt Instrument [Line Items]
Interest rate margin	1.50%
LIBOR | Minimum
Debt Instrument [Line Items]
Interest rate margin	1.50%
LIBOR | Maximum
Debt Instrument [Line Items]
Interest rate margin	2.50%