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Summary Accounting Policies - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Reclassifications            
Increase in escrow, deposits, and other assets and receivables $ 160 $ (143)        
Increase in accrued expenses and other liabilities (20) 500        
Net decrease in cash, cash equivalents and restricted cash   (4,070)        
Cash, cash equivalents, and restricted cash at beginning of year 14,668 18,450 $ 18,450      
Cash, cash equivalents, and restricted cash at end of year 14,518 14,380        
Cash and cash equivalents       $ 13,445 $ 13,766 $ 13,241
Restricted cash       429 443 572
Restricted cash included in escrow, deposits and other assets and receivables       644   567
Total cash, cash equivalents and restricted cash shown on the consolidated statements of cash flows $ 14,668 18,450 18,450 $ 14,518 $ 14,668 $ 14,380
Accounting Standards Update 2016-18            
Reclassifications            
Increase in escrow, deposits, and other assets and receivables     (323)      
Increase in accrued expenses and other liabilities     571      
Net decrease in cash, cash equivalents and restricted cash     (4,179)      
Cash, cash equivalents, and restricted cash at beginning of year   17,420 17,420      
Cash, cash equivalents, and restricted cash at end of year     13,241      
Total cash, cash equivalents and restricted cash shown on the consolidated statements of cash flows   $ 17,420 $ 17,420