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
Allowance for doubtful accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance $ 461 $ 272 $ 192
Additions 852 223 104
Deductions (Chargeoffs) (196) (34) (24)
Balance 1,117 461 272
Valuation allowance for deferred tax assets      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance 28,357 39,111 34,014
Additions 5,519   5,097
Deductions (Chargeoffs)   (10,754)  
Balance $ 33,876 $ 28,357 $ 39,111