Annual report pursuant to Section 13 and 15(d)

Debt (Details)

v3.19.3.a.u2
Debt (Details)
 12 Months Ended
Feb. 26, 2020
USD ($)
Oct. 19, 2018
Jun. 30, 2015
USD ($)
Dec. 31, 2019
USD ($)
Feb. 25, 2020
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]            
Outstanding borrowing under the credit facility       $ (80,000,000)    
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Remaining borrowing capacity       $ 96,100,000   $ 175,800,000
Maximum leverage ratio       4.0    
Revolving Credit Facility | Minimum            
Line of Credit Facility [Line Items]            
Interest coverage ratio       3.0    
Letter of Credit            
Line of Credit Facility [Line Items]            
Remaining borrowing capacity       $ 8,700,000   $ 8,400,000
Sturgeon Acquisitions LLC | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Basis spread on variable rate, percent     2.00%      
Maximum borrowing capacity     $ 25,000,000.0      
Debt instrument, term     3 years      
Sturgeon Acquisitions LLC | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)            
Line of Credit Facility [Line Items]            
Basis spread on variable rate, percent     3.00%      
Line of Credit | Revolving Credit Facility | Domestic Rate | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate, percent   1.00%        
Line of Credit | Revolving Credit Facility | Domestic Rate | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate, percent   1.50%        
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate, percent   2.00%        
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate, percent   2.50%        
Subsequent Event            
Line of Credit Facility [Line Items]            
Outstanding borrowing under the credit facility $ (9,000,000)          
Maximum borrowing capacity $ 180,000,000       $ 350,000,000  
Subsequent Event | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Maximum leverage ratio 2.5          
Debt covenant, minimum availability required $ 130,000,000       $ 185,000,000  
Subsequent Event | Revolving Credit Facility | Minimum            
Line of Credit Facility [Line Items]            
Interest coverage ratio 1.1          
Subsequent Event | Line of Credit            
Line of Credit Facility [Line Items]            
Outstanding borrowing under the credit facility $ (2,000,000)          
Subsequent Event | Line of Credit | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Outstanding borrowing under the credit facility (87,400,000)          
Remaining borrowing capacity $ 21,000,000          
Subsequent Event | Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate, percent 3.00%          
Subsequent Event | Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate, percent 3.50%