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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		9 Months Ended
	May 15, 2018 $ / shares shares	Apr. 03, 2018	Feb. 28, 2019 shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) component $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2019 shares
Share Repurchase Program
Authorized amount \| $				$ 93,000		$ 93,000
Capacity available to repurchase common stock under senior secured term loan \| $				448,000		448,000
Share-Based Compensation
Share-based compensation expense \| $				1,700	$ 2,800	6,556	$ 8,284
Estimated unrecognized compensation costs \| $				$ 6,600		$ 6,600
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized						1 year 4 months 17 days
Outstanding (in shares)				941,592		941,592		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	$ 52
Grant date fair value of stock options that vested \| $						$ 2,717	$ 3,014
Revolving Credit Facility \| April 3, 2018 Credit Agreement \| Line of Credit
Share Repurchase Program
Leverage ratio at which mandatory prepayments increase under the Credit Agreement (exceeds)		3.50
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)				271,000		271,000
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)				211,000		211,000
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)				460,000		460,000
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)				650,217		650,217		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)				385,000		385,000
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)					300,000	0	600,000
Average price of common stock purchased (in usd per share) \| $ / shares					$ 20.24		$ 21.03