Note 7 - Debt (Details Textual) - USD ($) $ in Thousands | Oct. 01, 2019 | May 08, 2019 | May 01, 2017 | Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Jan. 31, 2020 | Dec. 31, 2019 |
Proceeds from Issuance of Long-term Debt, Total | | | | | | $ 100,000 | $ 250,000 | | |
Amortization of Debt Issuance Costs | | | | | | 1,106 | $ 1,118 | | |
Debt Issuance Costs, Net, Total Reductions to Debt and Other, Noncurrent | | | | | $ 19,500 | 19,500 | | | $ 20,600 |
Debt Issuance Costs, Net, Total | | | | | 17,174 | 17,174 | | | 18,142 |
Other Noncurrent Assets [Member] | | | | | | | | | |
Debt Issuance Costs, Net, Total | | | | | 2,300 | 2,300 | | | $ 2,400 |
Financial Standby Letter of Credit [Member] | | | | | | | | | |
Letters of Credit Outstanding, Amount | | | | | | | | $ 22,000 | |
Secured Debt [Member] | | | | | | | | | |
Debt Instrument, Face Amount | | | | | 1,775,000 | 1,775,000 | | | |
Long-term Debt, Gross | | | | | 1,745,965 | 1,745,965 | | | |
Secured Debt [Member] | Incremental Term Loan B [Member] | | | | | | | | | |
Debt Instrument, Term (Year) | | | | 7 years | | | | | |
Secured Debt [Member] | Term Loan A-2 [Member] | | | | | | | | | |
Debt Instrument, Face Amount | [1],[2] | | | | 700,000 | 700,000 | | | |
Long-term Debt, Gross | [1],[2] | | | | $ 689,652 | $ 689,652 | | | |
Proceeds from Issuance of Long-term Debt, Total | | $ 450,000 | $ 250,000 | | | | | | |
Long Term Debt, Amortization Rate, First Twelve Months | | | | | 2.50% | 2.50% | | | |
Long Term Debt, Amortization Rate, Year Two | | | | | 2.50% | 2.50% | | | |
Long Term Debt, Amortization Rate, Year Three | | | | | 5.00% | 5.00% | | | |
Long Term Debt, Amortization Rate, Year Four | | | | | 7.50% | 7.50% | | | |
Long Term Debt, Amortization Rate, Year Five | | | | | 12.50% | 12.50% | | | |
Secured Debt [Member] | Term Loan A-2 [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | [1],[2],[3] | | | | | 1.50% | | | |
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 | $ 700,000 | | | |
Secured Debt [Member] | Term B-1 Loan [Member] | | | | | | | | | |
Debt Instrument, Face Amount | | | | | 500,000 | 500,000 | | | |
Long-term Debt, Gross | | | | | 486,250 | $ 486,250 | | | |
Secured Debt [Member] | Term B-1 Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | [3] | | | | | 1.75% | | | |
Secured Debt [Member] | Term B-1 Loan [Member] | CoBank, ACB [Member] | | | | | | | | | |
Debt Instrument, Face Amount | | | | | 500,000 | $ 500,000 | | | |
Secured Debt [Member] | Term B-2 Loan [Member] | | | | | | | | | |
Debt Instrument, Face Amount | | | | | 250,000 | 250,000 | | | |
Long-term Debt, Gross | | | | | 247,500 | $ 247,500 | | | |
Secured Debt [Member] | Term B-2 Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | [3] | | | | | 2.00% | | | |
Secured Debt [Member] | Term B-2 Loan [Member] | CoBank, ACB [Member] | | | | | | | | | |
Debt Instrument, Face Amount | | | | | 250,000 | $ 250,000 | | | |
Secured Debt [Member] | Term B-3 Loan [Member] | | | | | | | | | |
Debt Instrument, Face Amount | | | | | 325,000 | 325,000 | | | |
Long-term Debt, Gross | | | | | 322,563 | $ 322,563 | | | |
Secured Debt [Member] | Term B-3 Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | [3] | | | | | 2.00% | | | |
Secured Debt [Member] | Term B-3 Loan [Member] | CoBank, ACB [Member] | | | | | | | | | |
Debt Instrument, Face Amount | | | | | 325,000 | $ 325,000 | | | |
Secured Debt [Member] | Term Loan Borrowings [Member] | | | | | | | | | |
Long-term Debt, Gross | | | | | 1,800,000 | 1,800,000 | | | |
Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member] | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | 350,000 | $ 350,000 | | | |
Proceeds from Lines of Credit, Total | | | | | $ 100,000 | | | | |
Line of Credit Facility, Interest Rate at Period End | | | | | 2.43% | 2.43% | | | |
Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member] | Letter of Credit [Member] | | | | | | | | | |
Line of Credit Facility, Interest Rate at Period End | | | | | 1.63% | 1.63% | | | |
Long-term Line of Credit, Total | | | | | $ 28,700 | $ 28,700 | | | |
Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member] | Letter of Credit Issued to Third Party for FCC Performance Obligations with Offseting Collateral [Member] | | | | | | | | | |
Collateral Pledged By Third Party | | | | | | | | $ 22,000 | |
Letters of Credit Outstanding, Amount | | | | | 0 | 0 | | | |
Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member] | Senior Credit Facilities Due 2020 [Member] | | | | | | | | | |
Line of Credit Facility, Remaining Borrowing Capacity | | | | | $ 221,300 | $ 221,300 | | | |
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[1] | On May 8, 2019, $250 million was drawn. On October 1, 2019, an additional $450 million was drawn. | |
[2] | Per annum amortization rates for years one through five following the closing date are 2.5%, 2.5%, 5.0%, 7.5% and 12.5%, respectively. | |
[3] | 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 Credit Agreement). All other applicable margins are fixed. | |