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Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation Allowance |  |  |
Valuation allowance at beginning of year | $ 190,174 | $ 161,660 | $ 131,985
Increase (decrease) in valuation allowance as a result of mergers and acquisitions, net | (1,416) | 1,228 | 914
Increase in valuation allowance as a result of current year operations | 67,549 | 28,035 | 28,761
Decrease in valuation allowance as a result of foreign currency translation adjustment | (142) | (749) | 0
Valuation allowance at end of year | $ 256,165 | $ 190,174 | $ 161,660

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Change in the valuation allowance for deferred tax assets as a result of current year operations. + References No definition available. + Details
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- Definition Change in the valuation allowance for deferred tax assets as a result of mergers and acquisitions, net. + References No definition available. + Details
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- Definition Change in the valuation allowance for deferred tax assets as a result of foreign currency translation adjustments. + References No definition available. + Details
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