Annual report pursuant to Section 13 and 15(d)

Debt (Details)

v3.19.1
Debt (Details)
 12 Months Ended
Oct. 19, 2018
Jun. 30, 2015
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]        
Outstanding borrowing under the credit facility     $ 0 $ (99,900,000)
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Remaining borrowing capacity     $ 175,800,000 62,800,000
Maximum leverage ratio     4.0  
Debt covenant, minimum availability required     $ 10,000,000  
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     $ 8,400,000 $ 6,500,000
Sturgeon Acquisitions LLC | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   $ 25,000,000.0    
Basis spread on variable rate, percent   2.00%    
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%