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Stock-Based Compensation - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	May 01, 2019	Oct. 07, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised	$ 0
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value (in dollars per share)	$ 6.70	$ 18.38
Fair value of vested restricted stock awards	$ 9,100,000	$ 4,400,000
Unrecognized compensation costs	$ 36,600,000
Unrecognized compensation costs, period for recognition	2 years 4 months 24 days
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, period for recognition	1 year 6 months
Fair value of stock options vested	$ 4,400,000	3,700,000
Intrinsic value of options exercised	0	$ 200,000
Unrecognized compensation costs for stock options	$ 6,200,000
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Weighted average grant-date fair value (in dollars per share)	$ 6.68	$ 22.35
Unrecognized compensation costs	$ 6,700,000
Unrecognized compensation costs, period for recognition	2 years
2016 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)				16,500,000
Number of shares available for grant (in shares)	5,042,238
2016 Long Term Incentive Plan | Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Option expiration period	10 years
2019 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)			2,000,000
Officer and employees | Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Director | Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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