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Leases (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease cost | $ 411 | $ 411 |  |
Operating lease payments | 746 | 746 |  |
Operating lease right-of-use assets | 1,770 | 1,770 |  |
Operating lease liabilities | $ 1,770 | $ 1,770 |  |
Weighted average remaining lease term | 1 year 10 months 24 days | 1 year 10 months 24 days |  |
Weighted average discount rate | 3.10% | 3.10% |  |
2019 | $ 236 | $ 236 |  |
2020 | 934 | 934 |  |
2021 | 540 | 540 |  |
2022 | 60 | $ 60 |  |
Lessor, Operating Lease, Existence of Option to Extend [true false] |  | true |  |
Property, plant and equipment, gross | 561,666 | $ 561,666 | $ 547,951 | $ 543,177
Lease income | 733 | $ 2,232 |  |
Maximum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Remaining lease term |  | 3 years |  |
Commercial real estate leased to third parties |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Property, plant and equipment, gross | $ 36,362 | $ 36,362 |  |
Depreciation |  | $ 10,071 |  |
Commercial real estate leased to third parties | Maximum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Lessor, renewal term | 60 years | 60 years |  |

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77888421&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=118952077&loc=SL77927221-108306 + Details
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