UNAUDITED CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIENCY (Parenthetical) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Tax withholdings related to net share settlements of restricted stock units and awards	$ 0	$ 1,200,000	$ 2,400,000	$ 1,600,000
Treasury Stock
Shares withheld for withholding taxes (in shares)	0	79,554	162,496	94,531
Treasury Stock \| Restricted Stock and Restricted Stock Units \| Class A Common Stock
Share repurchase price (in dollars per share)	$ 0	$ 11.76	$ 14.95	$ 13.62

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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