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Represents the percentage of outstanding shares authorized to be repurchased under the stock repurchase plan.

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Amount of capacity under debt agreement to repurchase common stock as of the balance sheet date.

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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 cost to be recognized for option under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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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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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, 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 options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Amount of stock repurchase plan authorized.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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SHAREHOLDERS’ EQUITY AND SHARE-BASED COMPENSATION - Stock Repurchase Plan & Share-Based Compensation (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	May 15, 2018 $ / shares shares	Feb. 28, 2019 shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) component $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2019 shares
Share Repurchase Program
Authorized amount \| $			$ 94,000		$ 94,000
Capacity available to repurchase common stock under senior secured term loan \| $			448,000		448,000
Share-Based Compensation
Share-based compensation expense \| $			1,900	$ 2,800	4,824	$ 5,453
Estimated unrecognized compensation costs \| $			$ 8,500		$ 8,500
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized					1 year 6 months 3 days
Outstanding (in shares)			963,135		963,135		1,468,046
Stock options granted (in shares)					0	0
Weighted average fair value of stock options granted and total intrinsic value of stock options exercised
Intrinsic value of options exercised \| $					$ 0	$ 34
Grant date fair value of stock options that vested \| $					$ 2,602	$ 2,752
Employee and non-employee stock options
Share-Based Compensation
Performance criteria achieved (in shares)		228,000
Employee and non-employee stock options \| Service-Based
Share-Based Compensation
Outstanding (in shares)			280,000		280,000
Employee and non-employee stock options \| Service-Based \| Minimum
Share-Based Compensation
Vesting period					3 years
Employee and non-employee stock options \| Service-Based \| Maximum
Share-Based Compensation
Vesting period					4 years
Expiration term					10 years
Employee and non-employee stock options \| Market-Based
Share-Based Compensation
Outstanding (in shares)			222,000		222,000
Number of components of an award \| component					2
Allowable performance period before expiration date					3 years
Employee and non-employee stock options \| Market-Based \| Minimum
Share-Based Compensation
Vesting period					3 years
Expiration term					10 years
Employee and non-employee stock options \| Market-Based \| Maximum
Share-Based Compensation
Vesting period					4 years
Employee and non-employee stock options \| Market-Based, ordinary performance \| Minimum
Share-Based Compensation
Percentage of compounded annual gain of stock price over exercise price required for the award to vest					20.00%
Employee and non-employee stock options \| Market-Based, extraordinary performance \| Minimum
Share-Based Compensation
Percentage of compounded annual gain of stock price over exercise price required for the award to vest					25.00%
Employee and non-employee stock options \| Performance-Based
Share-Based Compensation
Outstanding (in shares)			461,000		461,000
Employee and non-employee stock options \| Performance-Based \| Minimum
Share-Based Compensation
Allowable performance period before expiration date					10 years
Attainment above threshold performance levels, vesting percentage					50.00%
Employee and non-employee stock options \| Performance-Based \| Maximum
Share-Based Compensation
Attainment above threshold performance levels, vesting percentage					200.00%
Employee and non-employee stock options \| Performance-Based, Vesting Period One
Share-Based Compensation
Vesting percentage					25.00%
Employee and non-employee stock options \| Performance-Based, Vesting Period Two
Share-Based Compensation
Vesting percentage					25.00%
Employee and non-employee stock options \| Performance-Based, Vesting Period Three
Share-Based Compensation
Vesting percentage					25.00%
Employee and non-employee stock options \| Performance-Based, Vesting Period Four
Share-Based Compensation
Vesting percentage					25.00%
Restricted Stock And Restricted Stock Units (RSUs)
Share-Based Compensation
Restricted shares and restricted share units outstanding (in shares)			676,450		676,450		636,146
Restricted share units granted (in shares)					349,459
Restricted share units granted, weighted average grant date fair value (in usd per share) \| $ / shares					$ 16.26
Restricted Stock And Restricted Stock Units (RSUs) \| Service-Based
Share-Based Compensation
Restricted shares and restricted share units outstanding (in shares)			411,000		411,000
Restricted Stock And Restricted Stock Units (RSUs) \| Service-Based \| Minimum
Share-Based Compensation
Vesting period					2 years
Restricted Stock And Restricted Stock Units (RSUs) \| Service-Based \| Maximum
Share-Based Compensation
Vesting period					4 years
Restricted Stock And Restricted Stock Units (RSUs) \| Performance-Based
Share-Based Compensation
Restricted shares and restricted share units outstanding (in shares)			265,000		265,000
Restricted Stock And Restricted Stock Units (RSUs) \| Performance-Based \| Maximum
Share-Based Compensation
Attainment above threshold performance levels, vesting percentage					225.00%
Restricted Stock And Restricted Stock Units (RSUs) \| Performance-Based, Vesting Period One
Share-Based Compensation
Vesting percentage					33.00%
Restricted Stock And Restricted Stock Units (RSUs) \| Performance-Based, Vesting Period Two
Share-Based Compensation
Vesting percentage					33.00%
Restricted Stock And Restricted Stock Units (RSUs) \| Performance-Based, Vesting Period Three
Share-Based Compensation
Vesting percentage					33.00%
Share Repurchase Program, Current
Share Repurchase Program
Number of shares of common stock authorized to be purchased (in shares)	4,300,000
Percentage of outstanding shares authorized to be repurchased	25.00%
Minimum purchase price authorized (in usd per share) \| $ / shares	$ 1.00
Maximum purchase price authorized (in usd per share) \| $ / shares	$ 500.00
Period that shares may be repurchased, from the date of approval	5 years
Remaining number of shares available for repurchase under the plan (in shares)			2,400,000		2,400,000
Number of shares of common stock purchased (in shares)				305,686	0	300,000
Average price of common stock purchased (in usd per share) \| $ / shares				$ 21.89		$ 21.89