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Schedule II - Valuation and Qualifying Accounts Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts:    
The roll forward of valuation accounts were as follows:    
Balance at beginning of period $ 476 $ 454
Charged to costs and expenses 695 499
Deductions (622) (477)
Balance at end of period 549 476
Valuation allowance for deferred tax assets:    
The roll forward of valuation accounts were as follows:    
Balance at beginning of period 2,556 35,416
Charged to costs and expenses 13 (32,860)
Deductions 0 0
Balance at end of period $ 2,569 $ 2,556