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Convertible Debt and Notes Payable - Term Loans, Other Notes Payable and Revolver (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 24, 2021
Jan. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Nov. 01, 2019
Sep. 30, 2019
Jul. 01, 2019
May 07, 2019
Dec. 14, 2017
Jun. 30, 2017
Debt and Capital Lease Obligations [Line Items]                        
Letter of credit, borrowing capacity $ 320,000,000                      
Other Notes Payable 74,982,000       $ 72,505,000              
Term Loan 291,303,000       0              
The Military Mutual Ltd [Member]                        
Debt and Capital Lease Obligations [Line Items]                        
Other Receivables           $ 28,400,000            
BMO Harris Bank | Revolving Credit Facility                        
Debt and Capital Lease Obligations [Line Items]                        
Letter of credit, borrowing capacity $ 25,000,000.0                      
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   $ 400,000                    
Convertible Debt                        
Debt and Capital Lease Obligations [Line Items]                        
Unamortized discount $ 5,800,000       $ 6,700,000              
Insurance Note                        
Debt and Capital Lease Obligations [Line Items]                        
Interest rate       2.01%                
Debt Instrument, Periodic Payment, Principal 300,000                      
Other Notes Payable 2,400,000     $ 3,000,000.0                
Revolving Credit Facility | BMO Harris Bank                        
Debt and Capital Lease Obligations [Line Items]                        
Interest Expense, Debt, Excluding Amortization $ 200,000                      
Corporate Debt                        
Debt and Capital Lease Obligations [Line Items]                        
Interest rate 6.00%                      
Debt Instrument, Periodic Payment, Principal $ 100,000                      
Other Long-term Debt 1,900,000           $ 2,600,000          
Purple Protect Asset S-91                        
Debt and Capital Lease Obligations [Line Items]                        
Interest Expense, Debt, Excluding Amortization 1,100,000                      
Interest rate   5.80%     6.07%              
Other Notes Payable           72,000,000.0            
Debt Issuance Costs, Gross           $ 1,700,000            
2028 Term Loan | Term Loan                        
Debt and Capital Lease Obligations [Line Items]                        
Debt Instrument, Face Amount     $ 300,000,000                  
Interest Expense, Debt, Excluding Amortization 200,000                      
Interest rate     3.25%                  
Debt Issuance Costs, Gross     $ 6,400,000                  
Term Loan 299,300,000                      
Unamortized discount     $ 1,500,000                  
Debt Instrument, Interest Rate, Effective Percentage     4.46%                  
2022 convertible note | Convertible Debt                        
Debt and Capital Lease Obligations [Line Items]                        
Debt Instrument, Face Amount                     $ 135,000,000.0  
Debt Issuance Costs, Gross                     2,200,000  
Unamortized discount                     $ 23,400,000  
Debt Instrument, Interest Rate, Effective Percentage                     7.13%  
2024 Notes | Senior Notes                        
Debt and Capital Lease Obligations [Line Items]                        
Debt Instrument, Face Amount                   $ 53,000,000.0    
Interest Expense, Debt, Excluding Amortization 1,400,000 $ 1,400,000                    
Interest rate                   7.25%    
Debt Issuance Costs, Gross               $ 600,000   $ 1,500,000    
Spike Line                        
Debt and Capital Lease Obligations [Line Items]                        
Interest Expense, Debt, Excluding Amortization 100,000                      
Maximum | Spike Line                        
Debt and Capital Lease Obligations [Line Items]                        
Line of Credit, Current $ 70,000,000