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Summary of Significant Accounting Policies Lessee, Lease Liability, Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Operating Leases [Line Items] |  |  |
2020 | $ 5,999 |  |
2021 | 3,348 |  |
2022 | 3,064 |  |
2023 | 2,000 |  |
2024 | 2,061 |  |
Thereafter | 36,580 |  |
Total future minimum lease payments | 53,052 |  |
Imputed interest | (24,576) |  |
Lease liabilities related to operating right-of-use assets (1) | 28,476 |  | $ 0
Other Liabilities [Member] |  |  |
Operating Leases [Line Items] |  |  |
Lease liabilities related to operating right-of-use assets (1) | $ 28,500 | $ 37,900 |

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. + 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 fifth 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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