Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Details)

v3.8.0.1
Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts Receivables-Allowance for doubtful accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 603 $ 1,525 $ 717
Charged to Costs and Expenses 368 (17) 1,125
Charged to Other Accounts (36) 235 98
Deductions (328) (1,140) (415)
Balance at End of Year 607 603 1,525
Allowance for Deferred Rent Receivable [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 373 1,962 1,418
Charged to Costs and Expenses (9) (1,589) 0
Charged to Other Accounts 0 0 544
Deductions 0 0 0
Balance at End of Year 364 373 1,962
Allowance for Deferred Tax Asset [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 2,062 2,062 2,062
Charged to Costs and Expenses (646) 0 0
Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Year $ 1,416 $ 2,062 $ 2,062