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Commitments and Contingencies (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) lease | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |
Number of properties subject to ground leases | lease | 1 |  |
Ground leases, rent expense | $ 33 | $ 40 | $ 23
Non-cancelable operating lease, rent expense | 1,411 | $ 1,415 | $ 1,385
Ground lease, future minimum lease obligations |  |  |
2018 | 23 |  |
2019 | 23 |  |
2020 | 23 |  |
2021 | 23 |  |
2022 | 23 |  |
Thereafter | 608 |  |
Total | 723 |  |
Office space |  |  |
2018 | 640 |  |
2019 | 463 |  |
2020 | 586 |  |
2021 | 441 |  |
2022 | 445 |  |
Thereafter | 931 |  |
Total | 3,506 |  |
Total |  |  |
2018 | 663 |  |
2019 | 609 |  |
2020 | 464 |  |
2021 | 486 |  |
2022 | 468 |  |
Thereafter | 1,539 |  |
Total | $ 4,229 |  |

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- Definition Amount of minimum lease payments for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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