Annual report pursuant to Section 13 and 15(d)

Debt - Narrative (Details)

v3.20.4
Debt - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Debt Instrument [Line Items]        
Financing costs $ 2,368,000 $ 2,789,000    
Amended and Restated        
Debt Instrument [Line Items]        
Financing costs       $ 636,000
Revolving loans, potential increment in maximum borrowing capacity $ 100,000,000      
Effective interest rate 4.80%      
Interest expense, net $ 12,700,000 13,300,000 $ 6,900,000  
Amended and Restated | Swap        
Debt Instrument [Line Items]        
Debt $ 145,000,000.0      
Amended and Restated | LIBOR        
Debt Instrument [Line Items]        
Base margin 3.00%      
Amended and Restated | Base Rate        
Debt Instrument [Line Items]        
Base margin 1.75%      
Amended and Restated | Minimum        
Debt Instrument [Line Items]        
Stated interest rate 3.75%      
Amended and Restated | Maximum        
Debt Instrument [Line Items]        
Stated interest rate 6.32%      
Revolving Loans        
Debt Instrument [Line Items]        
Revolving loans maximum borrowing capacity $ 350,000,000      
Letters of credit outstanding $ 0 $ 54,000