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Intangible Assets Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 1997
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets | $ 33,424 | $ 15,799 |  |
Document Period End Date | Dec. 31, 2019 |  |  |
Purchase premium customer relationships | $ 13,400 | 0 |  |
Net intangible assets | 20,245 | 7,059 |  |
Amortization of Intangible Assets | 745 | 647 | $ 616 |
Future Amortization of Intangible Assets |  |  |  |
2020 | 745 |  |  |
2021 | 647 |  |  |
2022 | 647 |  |  |
2023 | 647 |  |  |
2024 | 647 |  |  |
Concession Fees [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets | 6,800 | 6,800 |  |
Accumulated amortization of intangible assets | 6,052 | 5,780 |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets | 13,224 | 8,999 |  |
Accumulated amortization of intangible assets | 7,127 | $ 2,960 |  |
Service Agreements [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets | 4,128 |  |  |
Useful life of intangible assets |  |  |  | 25 years
Infrastructure [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets | 3,831 |  |  |
Contractual Rights [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets | $ 1,040 |  |  |
Minimum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life of intangible assets | 5 years |  |  |
Maximum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life of intangible assets | 70 years |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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