CONSOLIDATED AND COMBINED BALANCE SHEET (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable allowance	$ 9,263	$ 9,177
Class A Common Stock
Common stock, par value (USD per share)	$ 0.001
Common stock authorized (shares)	2,000,000,000
Common stock issued (shares)	62,818,000	0
Common stock outstanding (shares)	62,818,000	0
Class B Common Stock
Common stock, par value (USD per share)	$ 0.001
Common stock authorized (shares)	1,500,000,000
Common stock issued (shares)	415,186,000	0
Common stock outstanding (shares)	415,186,000	0
Class C Common Stock
Common stock, par value (USD per share)	$ 0.001
Common stock authorized (shares)	1,500,000,000
Common stock issued (shares)	0	0
Common stock outstanding (shares)	0	0

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.

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=84173941&loc=d3e5074-111524

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Face amount or stated value per share of common stock.

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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(29))
-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 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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