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Earnings Per Share - Summary of Shares Excluded From Diluted Earnings Per Share Calculation (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Out-of-the-money stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-diluted shares excluded from computation of earnings per share (in shares)	4,817	142	4,680	318
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-diluted shares excluded from computation of earnings per share (in shares)	8,000	0	8,000	0
Restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-diluted shares excluded from computation of earnings per share (in shares)	3,827	0	2,313	0
Weighted average shares of Class C Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-diluted shares excluded from computation of earnings per share (in shares)	10,351	0	11,446	13,056
Performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-diluted shares excluded from computation of earnings per share (in shares)	0	0	0	52
Employee Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-diluted shares excluded from computation of earnings per share (in shares)	8		0

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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