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Note 15 - Long-term Debt and Credit Arrangements (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 02, 2022
The Credit Agreement [Member]          
Consolidated Leverage Ratio, Covenant Maximum 3.25   3.25   3.25
Consolidated Interest Covenant Ratio, Covenant Minimum 3.00   3.00   3.00
Consolidated Leverage Ratio, Actual 2.57   2.57    
Consolidated Interest Coverage Ratio, Actual 6.53   6.53    
The Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate     1.80%    
Debt Instrument, Interest Rate, Effective Percentage 3.40%   3.40%    
The Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate     1.00%    
The Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate     2.00%    
The Credit Agreement [Member] | Base Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate     0.80%    
Debt Instrument, Interest Rate, Effective Percentage 5.50%   5.50%    
The Credit Agreement [Member] | Base Rate [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate     0.00%    
The Credit Agreement [Member] | Base Rate [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate     1.00%    
The Credit Agreement [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 350,000   $ 350,000    
Debt Instrument, Term (Year)     5 years    
Line of Credit Facility, Accordion Feature, Maximum Amount $ 200,000   $ 200,000    
Line Of Credit Facility, Accordion Feature, Percentage of EBITDA 100.00%   100.00%    
Line of Credit Facility, Remaining Borrowing Capacity $ 267,100   $ 267,100    
Letters of Credit Outstanding, Amount 32,900   32,900    
Long-Term Line of Credit, Total 50,000   50,000    
The Credit Agreement [Member] | Letter of Credit [Member]          
Line of Credit Facility, Maximum Borrowing Capacity 150,000   150,000    
The Credit Agreement [Member] | Financial Standby Letter of Credit [Member]          
Line of Credit Facility, Maximum Borrowing Capacity 75,000   75,000    
The Credit Agreement [Member] | Swingline Loans [Member]          
Debt Instrument, Covenant, Minimum Acquisition Cash Consideration for Leverage Ratio 20,000   $ 20,000    
The Credit Agreement [Member] | Term Loan [Member]          
Debt Instrument, Redemption Price, Percentage     100.00%    
The 2.75% Convertible Notes [Member] | Other (Income) Expense [Member]          
Amortization of Debt Discount (Premium) 0 $ 1,800 $ 0 $ 3,500  
Amortization of Debt Issuance Costs $ 400 $ 300 $ 700 $ 600