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Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
Balance at Beginning of Period $ 660 $ 477 $ 515
Charged to Profit and Loss 312 449 637
Deduction from Reserves (171) (266) (675)
Balance at End of Period 801 660 477
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
Balance at Beginning of Period 9,433 10,413 8,217
Charged to Profit and Loss 345 1,785 2,196
Deduction from Reserves (3,652) (2,765)
Balance at End of Period $ 6,126 $ 9,433 $ 10,413