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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deduction from asset accounts: |  |  |
Balance at Beginning of Period | $ 1,038 | $ 1,004 | $ 1,864
Charged to Expense | 214 | 86 | (462)
Accounts Written Off | (140) | (52) | (398)
Balance at End of Period | $ 1,112 | $ 1,038 | $ 1,004

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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