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Schedule II - Valuation and Qualifying Accounts (Valuation and Qualifying Accounts) (Details) - Allowance for doubtful accounts [Member] - 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 |  | $ 12,717 | $ 12,040 | $ 9,637
Additions - charged to costs and expenses |  | 9,475 | 8,598 | 9,587
Additions - charged to other accounts - describe |  | 0 | 0 | 0
Deductions - describe | [1] | 8,954 | 7,921 | 7,184
Balance at end of period |  | $ 13,238 | $ 12,717 | $ 12,040
[1] | Uncollectable accounts written off.

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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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