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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Increase (decrease) in valuation allowance | $ (49,600) |  |  |
Accounts Receivable Reserves |  |  |  |
Balance at beginning of period | 1,066 |  | $ 2,017 | $ 2,625
Charged to cost and expenses | 1,604 |  | 395 | 619
Write-offs | (1,040) |  | (1,346) | (1,227)
Balance at end of period | 1,630 |  | 1,066 | 2,017
Valuation Allowance Of Deferred Tax Assets [Member] |  |  |  |
Balance at beginning of period | 59,391 |  | 67,907 | 71,827
Net additions charged to income (expense) | (47,659) | [1] | (7,957) | (2,786)
Write-offs | (607) |  | (559) | (1,134)
Balance at end of period | $ 11,125 |  | $ 59,391 | $ 67,907
[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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