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Lessor Leases - Operating Lease Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Operating Leased Assets [Line Items] |  |  |  |  |
Rental income | $ 3,365 | $ 3,011 | $ 6,652 | $ 5,801 |
Total property and equipment, net | 52,847 |  | 52,847 |  | $ 51,500
Accumulated depreciation and amortization | 107,175 |  | 107,175 |  | 100,789
Depreciation | $ 4,400 | 3,800 | $ 8,400 | 7,300 |
Minimum |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Term of Contract ( in years ) | 1 year |  | 1 year |  |
Maximum |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Term of Contract ( in years ) | 7 years |  | 7 years |  |
Equipment |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Total property and equipment, net | $ 2,400 |  | $ 2,400 |  | 2,600
Accumulated depreciation and amortization | 1,300 |  | 1,300 |  | $ 1,200
Depreciation | $ 300 | $ 100 | $ 400 | $ 200 |

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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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