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Note 4 - Long-term Debt (Details Textual) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 03, 2017 | Feb. 07, 2017 | Sep. 14, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 16, 2018 | Jun. 14, 2016
Long-term Debt, Gross |  |  |  | $ 2,570,026 |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  | 750,000 | $ 641,438 | $ 1,656,000 |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  | (2,851) | (31,987) |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total |  |  |  | 94,500 | 97,000 | 76,200 |  |
Interest Costs Capitalized |  |  |  | $ 0 | $ 0 | $ 0 |  |
2024 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.125% | 5.125% |  |  |
Long-term Debt, Gross |  |  |  | $ 525,000 |  |  |  |
Unsecured Debt, Total |  |  |  | $ 525,000 | $ 525,000 |  |  |
2026 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.875% | 5.875% |  |  |
Long-term Debt, Gross |  |  |  | $ 700,000 |  |  |  |
Unsecured Debt, Total |  |  |  | $ 700,000 | $ 700,000 |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 500,000
2027 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 7.00% |  |  | 7.00% |
Long-term Debt, Gross |  |  |  | $ 750,000 |  |  |  |
Unsecured Debt, Total |  |  |  | 750,000 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 750,000 |
The 2017 Senior Credit Facility [Member] |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 595,026 | 635,234 |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  | 695,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  | 2,900 |  |  |
Debt Issuance Costs, Gross |  |  |  |  | $ 5,000 |  |  |
The 2017 Senior Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 100,000 |  | $ 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 |  |  |  | 4.60% |  |  |  |
Long-term Debt, Gross |  | $ 556,400 |  | $ 595,000 |  |  |  |
Proceeds from Issuance of Long-term Debt, Total | $ 85,000 |  |  |  |  |  |  |
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 Additional 2026 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.875% |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  | $ 206,000 |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 200,000 |  |  |  |  |
Debt Instrument, Issueing Price, Percentage |  |  | 103.00% |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 5.398% |  |  |  |

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