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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock-based compensation	$ 149,350	$ 242,417	$ 178,068
Cost of revenue
Stock-based compensation	10,173	11,388	5,307
Selling and marketing
Stock-based compensation	39,855	46,654	33,164
Technology and content
Stock-based compensation	54,633	63,536	26,766
General and administrative
Stock-based compensation	44,689	108,149	80,082
General and administrative
Stock-based compensation	$ 0	$ 12,690	$ 32,749

X

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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