Amount of noncash expense for share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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.

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No definition available.

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Stock-Based Compensation (Details 3) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 13,625	$ 18,505	$ 17,200
Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,400	$ 6,400	$ 6,300
Restricted Stock Service Based
Summary of non-vested stock options
Non-vested Shares, Beginning Balance (in shares)	897
Shares Granted (in shares)	243
Shares Vested (in shares)	(441)
Shares Forfeited (in shares)	(17)
Non-vested Shares, Ending Balance (in shares)	682	897
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average fair value, Beginning Balance (usd per share)	$ 26.19
Weighted average fair value, Granted (usd per share)	10.31
Weighted average fair value, Vested (usd per share)	27.03
Weighted average fair value, Forfeited (usd per share)	24.69
Weighted average fair value, Ending Balance (usd per share)	$ 20.01	$ 26.19
Restricted Stock Units Service Based
Summary of non-vested stock options
Non-vested Shares, Beginning Balance (in shares)	92
Shares Granted (in shares)	83
Shares Vested (in shares)	(92)
Shares Forfeited (in shares)	(8)
Non-vested Shares, Ending Balance (in shares)	75	92
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average fair value, Beginning Balance (usd per share)	$ 16.06
Weighted average fair value, Granted (usd per share)	8.85
Weighted average fair value, Vested (usd per share)	16.06
Weighted average fair value, Forfeited (usd per share)	8.85
Weighted average fair value, Ending Balance (usd per share)	$ 8.85	$ 16.06
Restricted Stock Units Performance Based
Summary of non-vested stock options
Non-vested Shares, Beginning Balance (in shares)	428
Shares Granted (in shares)	641
Shares Vested (in shares)	0
Shares Forfeited (in shares)	0
Non-vested Shares, Ending Balance (in shares)	1,069	428
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average fair value, Beginning Balance (usd per share)	$ 20.00
Weighted average fair value, Granted (usd per share)	1.74
Weighted average fair value, Vested (usd per share)	0
Weighted average fair value, Forfeited (usd per share)	0
Weighted average fair value, Ending Balance (usd per share)	$ 9.05	$ 20.00