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Note 5 - Long-term Debt (Details Textual)
$ in Thousands
Jun. 09, 2021
Jun. 08, 2021
USD ($)
May 25, 2021
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Long-term Line of Credit, Total       $ 878,011 $ 896,185
Bank Credit Facility [Member]          
Line of Credit Facility, Maximum Borrowing Capacity       1,033,700  
Line of Credit Facility, Remaining Borrowing Capacity       1,021,800  
Debt Instrument, Covenant, Total Net Leverage Ratio Removed     5.50    
Debt Instrument, Covenant, Requirement Removed, Maximum Proceeds of Borrowings Under Revolving Credit Facility to Be Used for Covenant Compliance     $ 200,000    
Bank Credit Facility [Member] | Revolving Credit Facility [Member]          
Long-term Line of Credit, Total       0  
Bank Credit Facility [Member] | Letter of Credit [Member]          
Long-term Line of Credit, Total       $ 11,900  
Senior Notes [Member] | The 4.750% Senior Notes Due June 2031 [Member]          
Debt Instrument, Face Amount   $ 900,000      
Debt Instrument, Interest Rate, Stated Percentage   4.75%   4.75%  
Percentage Ownership of Subsidiaries Guaranteeing Debt Instrument   100.00%      
Debt Issuance Costs, Gross   $ 14,500      
Senior Notes [Member] | The 4.750% Senior Notes Due June 2031 [Member] | Debt Instrument, Redemption, Period One [Member]          
Debt Instrument, Redemption Price, Percentage   100.00%      
Debt Instrument, Redemption Period, End Date   Jun. 15, 2026      
Senior Notes [Member] | The 4.750% Senior Notes Due June 2031 [Member] | Debt Instrument, Redemption, Period Two [Member]          
Debt Instrument, Redemption Price, Percentage   104.75%      
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemable   40.00%      
Debt Instrument, Redemption Period, Start Date   Jun. 15, 2024      
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.375% 6.375%     6.375%
Debt Instrument, Redemption Price, Percentage 103.188%        
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.00% 6.00%     6.00%
Debt Instrument, Redemption Price, Percentage 103.993%