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Schedule II - Valuation and Qualifying Accounts (Details) - Valuation and Qualifying Accounts - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for Doubtful Accounts [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Balance at beginning of period | $ 10,368 | $ 10,771 | $ 16,402
Charged to expenses | 7,333 | 3,886 | 3,521
Deductions | (3,783) | (4,289) | (9,152)
Balance at end of period | 13,918 | 10,368 | 10,771
Valuation Allowance of Deferred Tax Assets [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Balance at beginning of period | 34,302 | 63,712 | 71,912
Adjustments to valuation accounts | (6,397) | (29,410) | (8,200)
Balance at end of period | $ 27,905 | $ 34,302 | $ 63,712

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- Definition Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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