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Debt - Schedule of remaining principal payments for long term obligations (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Long-term Debt Outstanding Balance | $ 89,792 | $ 78,960
Less: Current portion of equipment notes | (3,681) | 0
Long-term principal obligations | 86,111 | 78,960
Notes Payable to Banks [Member] |  |
Long-term Debt Outstanding Balance | 31,486 | $ 0
Master Loan Agreement [Member] | Notes Payable to Banks [Member] |  |
2019 | 3,681 |
2020 | 3,835 |
2021 | 3,996 |
2022 | 4,163 |
2023 | 7,327 |
Thereafter | 8,484 |
Long-term Debt Outstanding Balance | 31,486 |
Less: Current portion of equipment notes | (3,681) |
Long-term principal obligations | $ 27,805 |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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)(3) -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(a)(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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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 + Details
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