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Note 4 - Long-term Debt (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 02, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Nov. 16, 2018
Long-term Debt, Gross |  | $ 2,570,000 | $ 3,967,000 |  |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  |  | 40,900 | $ 26,700 |  |
Interest Costs Capitalized |  |  | $ 0 | $ 0 |  |
2024 Notes [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.125% |  |  |
Long-term Debt, Gross |  | 525,000 | $ 525,000 |  |  |
Debt Issuance Costs, Net, Total |  | 6,000 | $ 6,000 |  |  |
2026 Notes [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.875% |  |  |
Long-term Debt, Gross |  | 700,000 | $ 700,000 |  |  |
Debt Issuance Costs, Net, Total |  | 8,000 | $ 8,000 |  |  |
2027 Notes [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.00% |  |  |
Long-term Debt, Gross |  | 750,000 | $ 750,000 |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 750,000
Debt Issuance Costs, Net, Total |  | 2,000 | 12,000 |  |  |
The 2017 Senior Credit Facility [Member] |  |  |  |  |  |
Long-term Debt, Gross |  | 595,000 |  |  |  |
Debt Issuance Costs, Net, Total |  | 9,000 |  |  |  |
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.70% |  |  |
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 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 100,000 |
The 2019 Senior Credit Facility [Member] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 1,992,000 |  |  |
Debt Issuance Costs, Net, Total |  |  | $ 49,000 |  |  |
The 2019 Senior Credit Facility [Member] | The 2019 Term Loan [Member] |  |  |  |  |  |
Long-term Debt, Gross | $ 1,400,000 |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Fee |  | $ 800 |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Fee Percentage |  | 1.25% |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 5.00% |  |  |
The 2019 Senior Credit Facility [Member] | The 2019 Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |  |  |  |  |
The 2019 Senior Credit Facility [Member] | The 2019 Term Loan [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |  |  |  |  |
The 2019 Senior Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 200,000 |  |  |  |  |
Line of Credit Facility, Expiration Period | 5 years |  |  |  |  |
The 2019 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.375% |  |  |
The 2019 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.50% |  |  |
The 2019 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.50% |  |  |
Debt Instrument, Basis Spread Used to Define Base Rate |  |  | 1.50% |  |  |
The 2019 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.50% |  |  |
The 2019 Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread Used to Define Base Rate |  |  | 0.50% |  |  |
The 2019 Term Loan [Member] |  |  |  |  |  |
Debt Issuance Costs, Net, Total |  |  | $ 42,500 |  |  |

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