Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Details)

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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivables-Allowance for doubtful accounts [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 607 $ 603 $ 1,525
Charged to Costs and Expenses 319 368 (17)
Charged to Other Accounts 0 (36) 235
Deductions (96) (328) (1,140)
Balance at End of Year 830 607 603
Allowance for Deferred Rent Receivable [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 364 373 1,962
Charged to Costs and Expenses 0 0 0
Charged to Other Accounts (100) (9) (1,589)
Deductions 0 0 0
Balance at End of Year 264 364 373
Allowance for Deferred Tax Asset [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 1,416 2,062 2,062
Charged to Costs and Expenses 668 (646) 0
Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Year $ 2,084 $ 1,416 $ 2,062