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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Maturity of liquid investments | three months or less |  |
Allowance for doubtful accounts receivable | $ 545 | $ 310 |
Deferred rent receivable allowance amount | $ 1,444 | 1,557 |
Minimum percentage of taxable income to be distributed | 90.00% |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |
Restricted Cash | $ 7,271 | 25,336 | $ 11,602
Prepayments of Penalties Associated with Retirement of Debt | $ 0 | 1,453 | 554
Capitalized Initial Direct Costs | $ 0.01 |  |
Operating Lease, Asset | $ 12,500 |  |
Operating Lease, Liability | 12,500 |  |
In-Place Leases and Tenant Relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of Intangible Assets | 6,267 | 6,648 | 6,717
Above and Below Market Leases |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of Intangible Assets | $ 1,095 | $ 1,116 | $ 996

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- Definition An element designated to encapsulate any additional information related to cash and cash equivalents not otherwise addressed by the existing taxonomy. Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. + References No definition available. + Details
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