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Significant Accounting Policies (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of allowance for doubtful accounts |  |  |
Beginning allowance for doubtful accounts | $ 8,835 | $ 10,303 | $ 6,596
Additions charged to expense | 13,067 | 16,947 | 22,225
Write-offs, net of recoveries | (11,878) | (18,415) | (18,518)
Ending allowance for doubtful accounts | $ 10,024 | $ 8,835 | $ 10,303

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 + Details
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