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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% |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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