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Note 12 - Borrowings and Financing Activities - Senior Notes (Details) - Senior Notes - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2020
Jun. 30, 2019
Sep. 30, 2017
Dec. 31, 2020
Senior Notes Due 2024        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     $ 450,000  
Proceeds from Issuance of Long-term Debt     $ 442,200  
Debt Instrument, Interest Rate, Stated Percentage     4.50%  
Senior Notes Due 2027        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount   $ 450,000    
Proceeds from Issuance of Long-term Debt   $ 442,200    
Debt Instrument, Interest Rate, Stated Percentage   4.875%    
Senior Notes Due 2024 and 2027        
Debt Instrument [Line Items]        
Percent of Stock With Ordinary Voting Rights That Company Must Retain In Order To Make Any Capital Stock Transactions       80.00%
Senior Notes Due 2025        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 525,000      
Proceeds from Issuance of Long-term Debt $ 515,600      
Debt Instrument, Interest Rate, Stated Percentage 6.625%      
Senior Notes Due 2024, 2025 and 2027 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Redemption Price, Percentage       100.00%
Debt Instrument, Basis Spread on Variable Rate       0.50%