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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
Valuation and Qualifying Accounts |  |  |
Balance at Beginning of Period | $ 4,574 | $ 3,664 | $ 3,088
Charged to Cost and Expenses | 823 | 2,456 | 2,682
Charged to Other Accounts | 0 | 0 | 0
Deductions, Actual Charge-Offs | (1,214) | (1,546) | (2,106)
Balance at End of Period | $ 4,183 | $ 4,574 | $ 3,664

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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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