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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 |  |  |
Balance at Beginning of Period | $ 1,525 | $ 1,952 | $ 695
Charged to (Reduction of) Costs and Expenses | 189 | (275) | 1,321
Taken Against Allowance | (360) | (152) | (64)
Other (Deductions) Recoveries | 0 | 0 | 0
Balance at End of Period | 1,354 | 1,525 | 1,952
Valuation on Allowance for Deferred Tax Assets |  |  |
Balance at Beginning of Period | 8,754 | 6,388 | 6,202
Charged to (Reduction of) Costs and Expenses | 8,135 | 2,366 | 186
Taken Against Allowance | 0 | 0 | 0
Other (Deductions) Recoveries | 0 | 0 | 0
Balance at End of Period | $ 16,889 | $ 8,754 | $ 6,388

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