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SCHEDULE II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for Doubtful Accounts |  |  |
Balance at Beginning of Period | $ 1,952 | $ 695 | $ 476
Charged to (Reduction of) Costs and Expenses | (275) | 1,321 | 1,085
Taken Against Allowance | (152) | (64) | (866)
Other (Deductions) Recoveries | 0 | 0 | 0
Balance at End of Period | 1,525 | 1,952 | 695
Valuation on Allowance for Deferred Tax Assets |  |  |
Balance at Beginning of Period | 6,388 | 6,202 | 7,691
Charged to (Reduction of) Costs and Expenses | 2,366 | 186 | (1,484)
Taken Against Allowance | 0 | 0 | 0
Other (Deductions) Recoveries | 0 | 0 | (5)
Balance at End of Period | $ 8,754 | $ 6,388 | $ 6,202

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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