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Note 4 - Long-term Debt - Long-term Debt Summary (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Long-term Debt, Gross | $ 2,570,026 |
Total outstanding principal | 2,570,026 | $ 1,860,234
Less current portion |  | (6,417)
Net carrying value | 2,549,224 | 1,831,011
Borrowing availability under the Revolving Credit Facility | 100,000 | 100,000
The 2017 Senior Credit Facility [Member] |  |
Long-term Debt, Gross | 595,026 | 635,234
Unamortized deferred loan costs | (9,261) | (11,777)
2024 Notes [Member] |  |
Long-term Debt, Gross | 525,000 |
Unsecured Debt, Total | 525,000 | 525,000
Unamortized deferred loan costs | (5,744) | (6,743)
2026 Notes [Member] |  |
Long-term Debt, Gross | 700,000 |
Unsecured Debt, Total | 700,000 | 700,000
Unamortized deferred loan costs | (8,359) | (9,473)
Unamortized premium | 4,576 | 5,187
2027 Notes [Member] |  |
Long-term Debt, Gross | 750,000 |
Unsecured Debt, Total | 750,000 |
Unamortized deferred loan costs | $ (2,014) |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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