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Debt Obligations (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Principal outstanding repayable |  |
2018 | $ 19,134 |
2019 | 38,537 |
2020 | 38,137 |
2021 | 704,374 |
2022 | 190,889 |
Thereafter | 258,405 |
Total | 1,249,476 | $ 1,103,743
Less: unamortized debt issuance costs | (16,629) | (18,338)
Total debt obligations | 1,232,847 | 1,085,405
Credit facility at a floating rate of interest of one-month LIBOR plus 2% and maturity date of April 2021 |  |
Long Term Debt |  |
Maximum borrowing capacity under credit facility | $ 890,000 |
Fixed rate (as a percent) | 2.10% |
Principal outstanding repayable |  |
Total | $ 666,000 | 491,000
WEST III Series A 2017-1 term notes payable at a fixed rate of interest of 4.69%, maturing in August 2042. Secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 4.69% |
Principal outstanding repayable |  |
Total | $ 282,686 | 289,295
WEST III Series B 2017-1 term notes payable at a fixed rate of interest of 6.36%, maturing in August 2042. Secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 6.36% |
Principal outstanding repayable |  |
Total | $ 40,425 | 41,370
WEST II Series 2012-A term notes payable at a fixed rate of interest of 5.50%, maturing in September 2037, secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 5.50% |
Principal outstanding repayable |  |
Total | $ 248,530 | 259,022
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024. Secured by an aircraft |  |
Principal outstanding repayable |  |
Total | $ 11,835 | 12,720
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024. Secured by an aircraft | Minimum |  |
Long Term Debt |  |
Fixed rate (as a percent) | 2.60% |
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024. Secured by an aircraft | Maximum |  |
Long Term Debt |  |
Fixed rate (as a percent) | 2.97% |
Note payable at a variable interest rate of 2.25%, maturing in January 2018, secured by engines |  |
Long Term Debt |  |
Fixed rate (as a percent) | 2.25% |
Principal outstanding repayable |  |
Total |  | $ 10,336
Revolving credit facility |  |
Long Term Debt |  |
Maximum borrowing capacity under credit facility | $ 890,000 |
Amount of debt available under accordion feature | 1,000,000 |
Line of credit facility outstanding amount | $ 666,000 |

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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/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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