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Summary Accounting Policies - Reclassifications (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Reclassifications          
Decrease in escrow, deposits, other assets and receivables $ (1,154) $ 273      
Increase in accrued expenses and other liabilities (1,400) 1,264      
Net decrease in cash, cash equivalents and restricted cash 3,136 (2,499)      
Cash, cash equivalents and restricted cash at beginning of year 14,668 18,450      
Cash, cash equivalents and restricted cash at end of period 17,804 15,951      
Cash and cash equivalents     $ 17,173 $ 13,766 $ 14,926
Restricted cash     379 443 530
Restricted cash included in escrow, deposits and other assets and receivables     252   495
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows $ 14,668 18,450 $ 17,804 $ 14,668 15,951
Accounting Standards Update 2016-18 | As Previously Reported          
Reclassifications          
Decrease in escrow, deposits, other assets and receivables   165      
Increase in accrued expenses and other liabilities   1,377      
Net decrease in cash, cash equivalents and restricted cash   (2,494)      
Cash, cash equivalents and restricted cash at beginning of year   17,420      
Cash, cash equivalents and restricted cash at end of period   14,926      
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows   $ 17,420     $ 14,926