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Convertible Debt and Notes Payable - Term Loans, Other Notes Payable and Revolver (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2021
Sep. 30, 2020
Jan. 31, 2020
Nov. 01, 2019
Jul. 01, 2019
Dec. 14, 2017
Dec. 08, 2017
Jun. 30, 2017
Debt and Capital Lease Obligations [Line Items]                      
Letter of credit, borrowing capacity $ 320,000,000                    
Other Notes Payable 72,505,000 $ 2,516,000                  
The Military Mutual Ltd [Member]                      
Debt and Capital Lease Obligations [Line Items]                      
Other Receivables $ 28,400,000                    
Notes Payable to Banks                      
Debt and Capital Lease Obligations [Line Items]                      
Debt Instrument, Face Amount               $ 4,000,000.0     $ 28,200,000
Short-term Debt, Percentage Bearing Variable Interest Rate 3.75%                    
Interest Expense, Debt, Excluding Amortization $ 800,000 1,800,000 $ 1,600,000                
Insurance Note                      
Debt and Capital Lease Obligations [Line Items]                      
Interest rate 2.01%                    
Debt Instrument, Periodic Payment, Principal $ 300,000                    
Other Notes Payable           $ 2,900,000          
Revolving Credit Facility | BMO Harris Bank                      
Debt and Capital Lease Obligations [Line Items]                      
Letter of credit, borrowing capacity 25,000,000.0                    
Corporate Debt                      
Debt and Capital Lease Obligations [Line Items]                      
Interest Expense, Debt, Excluding Amortization $ 100,000                    
Interest rate 6.00%                    
Debt Instrument, Periodic Payment, Principal $ 100,000                    
Other Long-term Debt 2,100,000           $ 2,600,000        
Purple Protect Asset S-91                      
Debt and Capital Lease Obligations [Line Items]                      
Interest Expense, Debt, Excluding Amortization $ 1,200,000                    
Interest rate 6.07%                    
Other Notes Payable         $ 72,000,000.0            
Debt Issuance Costs, Gross $ 1,700,000                    
Purple Protect Asset S-91 | Forecast                      
Debt and Capital Lease Obligations [Line Items]                      
Interest rate       5.80%              
2027 Notes | Senior Notes                      
Debt and Capital Lease Obligations [Line Items]                      
Debt Instrument, Face Amount                 $ 18,000,000.0 $ 120,000,000.0  
Interest Expense, Debt, Excluding Amortization 10,100,000 $ 10,100,000 $ 10,100,000                
Interest rate                   7.35%  
Debt Issuance Costs, Gross                   $ 5,000,000.0  
Spike Line                      
Debt and Capital Lease Obligations [Line Items]                      
Interest Expense, Debt, Excluding Amortization 400,000                    
Revolving Credit Facility                      
Debt and Capital Lease Obligations [Line Items]                      
Interest Expense, Debt, Excluding Amortization 300,000                    
Maximum | Spike Line                      
Debt and Capital Lease Obligations [Line Items]                      
Line of Credit, Current $ 70,000,000