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Note 8 - Debt (Details Textual) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 03, 2021 USD ($) | Mar. 05, 2021 USD ($) $ / shares | Nov. 09, 2020 USD ($) | Oct. 01, 2019 USD ($) | Jun. 14, 2019 USD ($) | May 08, 2019 USD ($) | Mar. 31, 2021 USD ($) | Oct. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  |  | $ 1,695,850 | $ 100,000 |
Amortization of Debt Issuance Costs |  |  |  |  |  |  |  |  |  | $ 1,400 | $ 1,100 | 4,300 | $ 3,300 |
Senior Unsecured Notes Due 2030 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 650,000 |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | 650,000 |  | 650,000 |  | $ 650,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed not Exceeding the Net Cash Proceeds from One or More Equity Offerings at a Redemption Price Equal to 104% of the Principal Amount |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant Repurchase, Percentage of Principle |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |
The 2026 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 575,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | 575,000 |  | 575,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  |  |  |  |  | 21 |  | 47 |  |
The 2028 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 345,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | 345,000 |  | 345,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.125% |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  |  |  |  |  | 9 |  | 21 |  |
The 2026 Notes and the 2028 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | $ 920,000 |  | $ 920,000 |  | $ 0
Debt Instrument, Convertible, Conversion Ratio |  |  | 0.4394 |  |  |  |  |  |  | 0.4394 |  | 0.4394 |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  | $ 2,275.83 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days |  |  | 20 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days |  |  | 30 |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  |  |  |  |  | $ 30 |  | $ 68 |  |
The 2026 Notes and the 2028 Notes [Member] | Company Undergoes a Fundamental Change [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Financial Standby Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  |  |  |  |  |  |  |  | $ 33,000 | 33,000 |  | 33,000 |  |
Bridge Loan [Member] | JPMorgan Chase Bank [Member] | Hargray [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Commitment, Termination Amount |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | 2,375,000 |  | 2,375,000 |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | 2,320,323 |  | 2,320,323 |  |
Secured Debt [Member] | Term Loan B-4 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 800,000 |  |  |  |  |  |  |  | 800,000 |  | $ 800,000 |  |
Long Term Debt, Amortization Rate |  | 1.00% |  |  |  |  |  |  |  |  |  | 1.00% |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | 798,000 |  | $ 798,000 |  |
Secured Debt [Member] | Term Loan B-4 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |  |  |  |  |  |  |  | 2.00% |  |
Secured Debt [Member] | Term Loan B-4 [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt [Member] | Term Loan A-2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | 700,000 |  | $ 700,000 |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | 663,845 |  | $ 663,845 |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  | $ 450,000 |  | $ 250,000 |  |  |  |  |  |  |
Long Term Debt, Amortization Rate, First Twelve Months |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Long Term Debt, Amortization Rate, Year Two |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Long Term Debt, Amortization Rate, Year Three |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
Long Term Debt, Amortization Rate, Year Four |  |  |  |  |  |  |  |  | 7.50% |  |  |  |  |
Long Term Debt, Amortization Rate, Year Five |  |  |  |  |  |  |  |  | 12.50% |  |  |  |  |
Secured Debt [Member] | Term Loan A-2 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | [1] |  |  |  |  |  |  |  |  |  |  | 1.75% |  |
Secured Debt [Member] | Term Loan A-2 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |
Secured Debt [Member] | Term Loan A-2 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  | 1.75% |  |
Secured Debt [Member] | Term Loan A-2 [Member] | CoBank, ACB [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |
Secured Debt [Member] | Term B-2 Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | 250,000 |  | $ 250,000 |  |
Long Term Debt, Amortization Rate | [2] |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | 243,750 |  | $ 243,750 |  |
Secured Debt [Member] | Term B-2 Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | [1] |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Secured Debt [Member] | Term B-2 Loan [Member] | CoBank, ACB [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |
Secured Debt [Member] | Term B-3 Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | 625,000 |  | $ 625,000 |  |
Long Term Debt, Amortization Rate | [2] |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | 614,728 |  | $ 614,728 |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  | $ 325,000 |  |  | 300,000 |  |  |  |  |
Secured Debt [Member] | Term B-3 Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | [1] |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Secured Debt [Member] | Term B-3 Loan [Member] | CoBank, ACB [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | 625,000 |  |  |  |  |
Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  | 458,600 |  | $ 458,600 |  |
Letter of Credit [Member] | JPMorgan Chase Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  |  | $ 41,400 |  | $ 41,400 |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  |  |  |  |  |  | 1.88% |  | 1.88% |  |
Letter of Credit [Member] | JPMorgan Chase Bank [Member] | Letter of Credit Issued to Third Party for FCC Performance Obligations with Offseting Collateral [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |
Letter of Credit [Member] | Term Loan Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  | $ 2,300,000 |  | $ 2,300,000 |  |
[1] | The Term Loan A-2 interest rate spread can vary between 1.25% and 1.75%, determined on a quarterly basis by reference to a pricing grid based on the Company’s Total Net Leverage Ratio (as defined in the Third Amended and Restated Credit Agreement). All other applicable margins are fixed.
[2] | Payable in equal quarterly installments (expressed as a percentage of the original principal amount and subject to customary adjustments in the event of any prepayment). All loans may be prepaid at any time without penalty or premium (subject to customary LIBOR breakage provisions), except for the Term Loan B-4, which has a 1.0% prepayment premium for any prepayment within six months of the funding date of the Term Loan B-4 in connection with certain repricing transactions.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + Details
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