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Note 13 - Notes Payable (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 01, 2020
Feb. 29, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 31, 2020
Gain (Loss) on Extinguishment of Debt, Total     $ (7,538) $ 0 $ (12,762)  
Debt Covenants Dividend Payment Restriction Maximum Payment     26,000      
Term Loan [Member]            
Debt Instrument, Face Amount $ 590,000          
Debt Instrument, Covenant, Additional Amount Through an Accordion Feature $ 750,000          
Unsecured Debt [Member]            
Debt Issuance Costs, Net, Total     $ 55,800      
London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.40%          
Base Rate [Member] | Term Loan [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.40%          
Revolving Credit Facility [Member]            
Debt Instrument, Basis Spread on Variable Rate   0.765%        
Debt Instrument, Interest Rate, Effective Percentage     0.91% 2.64%    
Line of Credit Facility, Current Borrowing Capacity   $ 2,000,000       $ 2,250,000
Debt Instrument, Increase (Decrease) In Effective Interest Rate     (0.01%)      
Long-term Line of Credit, Total     $ 0      
Revolving Credit Facility [Member] | Credit Facility Accordion Feature [Member]            
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,750,000        
Revolving Credit Facility [Member] | Other Assets [Member]            
Debt Issuance Costs, Net, Total     $ 5,600      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate     0.765% 0.875%    
Letter of Credit [Member]            
Long-term Line of Credit, Total     $ 300