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Note 3 - Long-term Debt (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 27, 2018 | Feb. 07, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total |  |  |  | $ 74,400 | $ 77,500 |
Interest Costs Capitalized |  |  |  | 0 | 0 |
Repayments of Long-term Debt, Total |  |  |  | $ 40,208 | $ 561,037 |
2024 Notes [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.125% |  | 5.125%
Unsecured Debt, Total |  |  |  | $ 525,000 |  | $ 525,000
2026 Notes [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.875% |  | 5.875%
Unsecured Debt, Total |  |  |  | $ 700,000 |  | $ 700,000
The 2017 Senior Credit Facility [Member] |  |  |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  | 695,000 |  |
Long-term Debt, Gross |  |  |  | 595,026 |  | $ 635,234
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 100,000 |  |
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.375% |  |  |  |
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.50% |  |  |  |
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread Used to Define Base Rate |  | 1.00% |  |  |  |
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50% |  |  |  |
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread Used to Define Base Rate |  | 0.50% |  |  |  |
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.40% |  |
Long-term Debt, Gross |  |  |  | $ 595,000 |  |
Repayments of Long-term Debt, Total | $ 37,000 |  |  |  |  |
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |
Debt Instrument, Basis Spread on Variable Rate if Leverage Ratio is Less Than or Equal to 5.25 |  | 2.25% |  |  |  |
Debt Instrument, Interest Rate, Applicable Margin, If Leverage Ratio is Greater than 5.25 |  | 2.50% |  |  |  |
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |  |
Debt Instrument, Basis Spread on Variable Rate if Leverage Ratio is Less Than or Equal to 5.25 |  | 1.25% |  |  |  |
Debt Instrument, Interest Rate, Applicable Margin, If Leverage Ratio is Greater than 5.25 |  | 1.50% |  |  |  |
The 2018 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 200,000 |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |
The 2018 Senior Credit Facility [Member] | The 2018 Term Loan [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 1,400,000 |  |  |
2027 Notes [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.00% |  |  |
Unsecured Debt, Total |  |  | $ 750,000 |  |  |

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