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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Increase (decrease) in valuation allowance |  |  | $ (49,600) |
Accounts Receivable Reserves |  |  |  |
Balance at beginning of period | $ 1,630 |  | 1,066 | $ 2,017
Charged to cost and expenses | 2,173 |  | 1,604 | 395
Write-offs | (2,694) |  | (1,040) | (1,346)
Balance at end of period | 1,109 |  | 1,630 | 1,066
Valuation Allowance Of Deferred Tax Assets [Member] |  |  |  |
Balance at beginning of period | 11,125 |  | 59,391 | 67,907
Net additions charged to income (expense) | 874 | [1] | (47,659) | (7,957)
Write-offs | (13) |  | (607) | (559)
Balance at end of period | $ 11,986 |  | $ 11,125 | $ 59,391
[1] | The Company recorded the release of a valuation allowance associated with its U.S. federal, certain state and foreign deferred tax assets of $49.6 million.

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e32123-109318 + Details
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