Note 6 - Long-term Debt (Details Textual) $ in Thousands | May 01, 2017USD ($) | Jun. 30, 2015USD ($) | Jun. 30, 2017USD ($) | Sep. 30, 2017USD ($) | Sep. 30, 2016USD ($) | Dec. 31, 2016USD ($) | Jun. 17, 2015USD ($) |
Debt Issuance Costs, Net | | | | $ 20,576 | | $ 8,148 | |
Write off of Deferred Debt Issuance Cost | | | | 613 | | | |
Secured Debt [Member] | | | | | | | |
Debt Instrument, Face Amount | $ 750,000 | | | | | | |
Debt Issuance Costs, Net | | | $ 15,200 | | | | |
Write off of Deferred Debt Issuance Cost | | | $ 600 | | | | |
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 | | | | $ 248,400 | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | 3.07% | | | |
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% | | | | | | |
Long Term Debt, Amortization Rate, Year Five | 10.00% | | | | | | |
Secured Debt [Member] | Incremental Term Loan B [Member] | | | | | | | |
Debt Instrument, Face Amount | $ 500,000 | | | | | | |
Debt Instrument, Term | 7 years | | | | | | |
Long-term Debt, Gross | | | | $ 498,800 | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | 3.57% | | | |
Debt Instrument, Amortization Percent on a Quarterly Basis | 1.00% | | | | | | |
Debt Instrument, Prepayment Penalty, Prepaid within Six Months, Percent | 1.00% | | | | | | |
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Incremental Term Loan B [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 2.25% | | | | | | |
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Incremental Term Loan A [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 1.50% | | | | | | |
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Incremental Term Loan A [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 2.25% | | | | | | |
Secured Debt [Member] | Base Rate [Member] | Incremental Term Loan B [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 1.25% | | | | | | |
Secured Debt [Member] | Base Rate [Member] | Minimum [Member] | Incremental Term Loan A [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 0.50% | | | | | | |
Secured Debt [Member] | Base Rate [Member] | Maximum [Member] | Incremental Term Loan A [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 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] | JPMorgan Chase Bank [Member] | Minimum [Member] | | | | | | | |
Line of Credit Facility, Commitment Fee Percentage | | | | 0.25% | | | |
Senior Credit Facilities Due 2020 [Member] | JPMorgan Chase Bank [Member] | Maximum [Member] | | | | | | | |
Line of Credit Facility, Commitment Fee Percentage | | | | 0.40% | | | |
Senior Credit Facilities Due 2020 [Member] | JPMorgan Chase Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 1.50% | | | |
Senior Credit Facilities Due 2020 [Member] | JPMorgan Chase Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 2.25% | | | |
Senior Credit Facilities Due 2020 [Member] | JPMorgan Chase Bank [Member] | Base Rate [Member] | Minimum [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 0.50% | | | |
Senior Credit Facilities Due 2020 [Member] | JPMorgan Chase Bank [Member] | Base Rate [Member] | Maximum [Member] | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 1.25% | | | |
Senior Credit Facilities Due 2020 [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member] | | | | | | | |
Debt Instrument, Term | | 5 years | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | $ 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] | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | 1.75% | | | |
Line of Credit Facility, Remaining Borrowing Capacity | | | | $ 196,900 | | | |