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Employee stock purchase plan, minimum percentage of common stock fair value as defined by the plan to purchase shares by eligible participants.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Shares Expected Vested

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The grant date fair value of service-based or performance-based restricted stock awards, granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The purchase price per share which is the lower of the fair value of the common stock at the beginning or end of the offering period.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Amount of cost for defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Amount of expense for employee benefit and equity-based compensation.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible restructuring charges.

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Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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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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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options outstanding, including both vested and non-vested options.

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Number of shares purchased for issuance under share-based payment arrangement.

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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) hour $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Apr. 01, 2020 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)		0		0		0
Share based compensation, shares authorized (in shares)		15,825,223
Share based compensation, shares authorized for future grant (in shares)		2,776,440
Intrinsic value of nonvested restricted stock awards expected to vest \| $		$ 22,800,000
Unrecognized compensation related to non-vested awards \| $		$ 10,700,000
Unrecognized compensation costs, weighted average period expected to be recognized		2 years
Proceeds from employee common stock purchases \| $		$ 1,509,000		$ 1,443,000		$ 1,382,000
Defined Contribution 401(k) Profit Sharing Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined contribution plan, eligibility, hours of service \| hour		1,000
Defined contribution plan, employer matching contribution, percent of employees' gross pay		5.00%
Defined contribution plan, cost \| $		$ 3,300,000		2,900,000		2,700,000
Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, shares authorized (in shares)		2,321,688
Share based compensation, shares authorized for future grant (in shares)		787,353
Percentage of compensation eligible employees can use to purchase common stock, maximum		15.00%
Compensation amount that eligible employees can use to purchase common stock \| $		$ 25,000
Percentage of fair market value eligible employees can purchase common stock as defined, minimum		85.00%
Employee stock purchase plan, per share price (in usd per share) \| $ / shares	$ 14.56		$ 14.56		$ 11.31		$ 11.31	$ 21.27
Employee stock purchase plan, shares purchased (in shares)			103,628		127,600		122,152
Proceeds from employee common stock purchases \| $			$ 1,500,000		$ 1,400,000		$ 1,400,000
One-time termination benefits
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance costs \| $				2,600,000
One time cash payment \| $				1,500,000
Stock based compensation expense \| $				1,100,000
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, award shares granted in period (in shares)		341,273
Forfeited shares (in shares)		23,830
Vested (in shares)		298,479
Share based compensation, fair value of restricted stock vested \| $		$ 5,100,000		$ 5,500,000		$ 5,100,000
Granted (in usd per share) \| $ / shares		$ 21.12		$ 16.96		$ 14.15
Restricted stock \| One-time termination benefits
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)				44,507
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, award shares granted in period (in shares)		137,052
Share based compensation, annual award vesting period from date of grant		3 years		3 years		3 years
Forfeited shares (in shares)		87,241
Vested (in shares)		0
Share based compensation, fair value of restricted stock vested \| $				$ 1,800,000
Granted (in usd per share) \| $ / shares		$ 20.55		$ 17.27		$ 13.70
Share-based compensation arrangement by share-based payment award vested (in shares)		0				0
Performance shares \| One-time termination benefits
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)				37,463
Service based awards \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, award shares granted in period (in shares)		9,256
Share based compensation, award granted \| $		$ 200,000
Share based compensation, annual award vesting period from date of grant		2 years
Share based compensation, award annual installment vesting rate		50.00%
Performance Period 2018 to 2020 \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, award shares earned in period (in shares)		33,715
Share based compensation, dividend earned on shares subject to the awards (in shares)		1,905
Forfeited shares (in shares)	106,379
Performance Period 2017 to 2019 \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, award shares earned in period (in shares)				0
Share based compensation, dividend earned on shares subject to the awards (in shares)				0
Forfeited shares (in shares)				87,241
Performance Period 2016 to 2018 \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, award shares earned in period (in shares)						64,846
Share based compensation, dividend earned on shares subject to the awards (in shares)						4,226
Forfeited shares (in shares)						73,345
Employees and executives \| Service based awards \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, award shares granted in period (in shares)		297,410
Share based compensation, award granted \| $		$ 6,300,000
Share based compensation, annual award vesting period from date of grant		1 year
Share based compensation, award annual installment vesting rate		25.00%
Non employee directors \| Service based awards \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, award shares granted in period (in shares)		34,607
Share based compensation, award granted \| $		$ 700,000
Share based compensation, annual award vesting period from date of grant		1 year
Executives \| Performance based awards \| Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation, award shares granted in period (in shares)	137,052
Share based compensation, award granted \| $	$ 2,800,000
Share based compensation, annual award vesting period from date of grant	3 years	3 years