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) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Year $ 3,069 $ 691
Charged to Costs and Expense 434 2,821
Deductions from Reserves (32) (443)
Balance at End of Year $ 3,471 $ 3,069