Annual report pursuant to Section 13 and 15(d)

Leases - Additional Information (Details)

v3.20.1
Leases - Additional Information (Details)
$ in Thousands
 12 Months Ended
Jan. 24, 2018
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Nov. 30, 2018
Operating Lease Average Remaining Lease Term   10 years        
Operating Lease, Lease Income   $ 70,515 $ 53,138 $ 30,223    
Operating Lease, Variable Lease Income   $ 5,341        
Operating Lease, Weighted Average Remaining Lease Term   24 years        
Operating Lease, Liability   $ 2,405     $ 2,200  
Operating Lease, Liability, Statement of Financial Position [Extensible List]   Operating Lease, Liability     Other Liabilities  
Operating Lease, Right-of-Use Asset   $ 3,077     $ 2,200  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]         Other Assets, Noncurrent  
Operating Lease, Weighted Average Discount Rate, Percent   4.40%        
Operating Lease, Expense   $ 107        
Increase In Operating Lease Right Of Use Assets   100        
Increase In Operating Lease Liabilities   $ 100        
Lessor, Operating Lease, Renewal Term     2 years 6 months     2 years 6 months
Moline Facility [Member]            
Lessee, Operating Lease, Renewal Term     10 years      
Operating Lease, Weighted Average Remaining Lease Term 10 years          
Number of Renewal Options Allowed | item 12   12      
Lessor, Operating Lease, Renewal Term 5 years 20 years 10 years      
Silvis facility [Member]            
Operating Lease, Weighted Average Remaining Lease Term 67 years   67 years