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Commitments and Contingencies | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Commitments and Contingencies | Commitments and Contingencies Ground Leases We are obligated as lessee under four ground leases. Future minimum rental payments due under the terms of these leases as of December 31, 2017, are as follows (dollars in thousands):
For the year ended December 31, |  | Minimum Rental Payments Due
2018 |  | $ | 465 |
2019 |  | 465 |
2020 |  | 466 |
2021 |  | 392 |
2022 |  | 319 |
Thereafter |  | 4,236 |
|  | $ | 6,343 |
Rental expenses recorded in connection with the properties on which we are ground lease tenants was $0.5 million for the year ended December 31, 2017, $0.5 million for the year ended December 31, 2016, and $0.4 million for the year ended December 31, 2015. Rental expenses are reflected in property operating expenses on the consolidated statements of operations and comprehensive income. Letters of Credit As of December 31, 2017, there was $1.0 million outstanding under letters of credit. These letters of credit are not reflected on our consolidated balance sheet.

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details
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