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Restructuring and Related Reorganization Charges - Restructuring and Related Reorganization Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Reserve [Roll Forward] |  |  |  |
Beginning balance |  | $ 18,424 | $ 47,012 | $ 23,775
Charges | [1] | 16,738 | 55,907 | 104,871
Payments |  | (26,727) | (71,374) | (47,796)
Non-cash items |  | 879 | (13,121) | (33,838)
Ending balance |  | 9,314 | 18,424 | 47,012
Employee Severance and Benefits |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Beginning balance |  | 18,150 | 45,889 | 10,117
Charges |  | 8,380 | 39,477 | 66,255
Payments |  | (19,005) | (66,442) | (29,388)
Non-cash items |  | 810 | (774) | (1,095)
Ending balance |  | 8,335 | 18,150 | 45,889
Stock-based Compensation |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Beginning balance |  | 0 | 0 | 0
Charges |  | 0 | 12,690 | 32,749
Payments |  | 0 | 0 | 0
Non-cash items |  | 0 | (12,690) | (32,749)
Ending balance |  | 0 | 0 | 0
Other |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Beginning balance |  | 274 | 1,123 | 13,658
Charges |  | 8,358 | 3,740 | 5,867
Payments |  | (7,722) | (4,932) | (18,408)
Non-cash items |  | 69 | 343 | 6
Ending balance |  | $ 979 | $ 274 | $ 1,123
[1] | (1) Includes stock-based compensation as follows: Cost of revenue$10,173 $11,388 $5,307Selling and marketing39,855 46,654 33,164Technology and content54,633 63,536 26,766General and administrative44,689 108,149 80,082Restructuring and related reorganization charges— 12,690 32,749

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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