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Note 8 - Long-term Debt (Details Textual) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended | 26 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 23, 2018 USD ($) | May 01, 2017 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Apr. 22, 2018 | Jun. 30, 2020 | Dec. 31, 2017 USD ($) | Jun. 17, 2015 USD ($)
Debt Issuance Costs, Net, Total |  |  |  | $ 18,615 |  |  |  | $ 19,585 |
Amortization of Debt Issuance Costs |  |  |  | 970 | $ 400 |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 750,000 |  |  |  |  |  |  |
Optional Additional Available Credit Facilities |  | $ 425,000 |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum First Lien Net Leverage Ratio |  | 1.8 |  |  |  |  |  |  |
Secured Debt [Member] | Incremental Term Loan A [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 250,000 |  |  |  |  |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 245,300 |  |  |  |  |
Long Term Debt, Amortization Rate, First Twelve Months |  | 2.50% |  |  |  |  |  |  |
Long Term Debt, Amortization Rate, Year Two |  | 5.00% |  |  |  |  |  |  |
Long Term Debt, Amortization Rate, Year Three |  | 7.50% |  |  |  |  |  |  |
Long Term Debt, Amortization Rate, Year Four |  | 10.00% |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 4.06% |  |  |  |  |
Secured Debt [Member] | Incremental Term Loan A [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |  |  |  |
Secured Debt [Member] | Incremental Term Loan A [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |  |  |  |
Secured Debt [Member] | Incremental Term Loan A [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50% |  |  |  |  |  |  |
Secured Debt [Member] | Incremental Term Loan A [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |  |  |  |  |
Secured Debt [Member] | Incremental Term Loan B [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500,000 |  |  |  |  |  |  |
Debt Instrument, Term |  | 7 years |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 496,300 |  |  |  |  |
Debt Instrument, Amortization Percent on a Quarterly Basis |  | 1.00% |  |  |  |  |  |  |
Debt Instrument, Prepayment Penalty, Prepaid within Six Months, Percent |  | 1.00% |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 4.56% |  |  |  |  |
Secured Debt [Member] | Incremental Term Loan B [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net, Total | $ 2,000 |  |  |  |  |  |  |  |
Secured Debt [Member] | Incremental Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 1.75% |  |
Secured Debt [Member] | Incremental Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75% |  |  |  |  | 2.25% |  |  |
Secured Debt [Member] | Incremental Term Loan B [Member] | Base Rate [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 0.75% |  |
Secured Debt [Member] | Incremental Term Loan B [Member] | Base Rate [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.75% |  |  |  |  | 1.25% |  |  |
Senior Unsecured Notes Due 2022 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 450,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 5.75%
Senior Credit Facilities Due 2020 [Member] | JPMorgan Chase Bank [Member] |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 3,100 |  |  |  |  |
Senior Credit Facilities Due 2020 [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |  |  |  |
Debt Issuance Costs, Net, Total | $ 200,000 |  |  |  |  |  |  |  |
Senior Credit Facilities Due 2020 [Member] | Secured Debt [Member] | JPMorgan Chase Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 100,000 |  |  |  |  |  |
Senior Credit Facilities Due 2020 [Member] | Letter of Credit [Member] | JPMorgan Chase Bank [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | $ 196,900 |  |  |  |  |

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