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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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SHAREHOLDERS’ EQUITY AND SHARE-BASED COMPENSATION - Stock Repurchase Plan & Share-Based Compensation (Details)		3 Months Ended		9 Months Ended
	May 15, 2018 $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) component $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2018 shares
Share Repurchase Program
Authorized amount (in dollars) \| $		$ 104,000,000		$ 104,000,000
Capacity available to repurchase common stock under senior secured term loan (in dollars) \| $		443,000,000		443,000,000
Share-Based Compensation
Share-based compensation expense \| $		2,800,000	$ 2,000,000	8,284,000	$ 6,150,000
Estimated unrecognized compensation costs (in dollars) \| $		$ 11,700,000		$ 11,700,000
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized				1 year 7 months 13 days
Outstanding (in shares)		1,494,491		1,494,491		1,440,566
Weighted average fair value of stock options granted and total intrinsic value of stock options exercised
Weighted average grant date fair value of stock options granted per share (in usd per share) \| $ / shares				$ 0.00	$ 16.27
Intrinsic value of options exercised \| $				$ 52,000	$ 4,584,000
Grant date fair value of stock options that vested \| $				$ 3,014,000	$ 1,598,000
Employee and non-employee stock options
Share-Based Compensation
Stock options granted (in shares)				0	272,000
Performance criteria achieved (in shares)				227,849
Weighted average exercise price of stock options granted (in usd per share) \| $ / shares					$ 25.06
Employee and non-employee stock options \| Service-Based
Share-Based Compensation
Outstanding (in shares)		438,000		438,000
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)		584,000		584,000
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)		472,000		472,000
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)		669,708		669,708		485,806
Restricted share units granted (in shares)				401,458
Restricted share units granted, weighted average grant date fair value (in usd per share) \| $ / shares				$ 24.61
Restricted Stock And Restricted Stock Units (RSUs) \| Service-Based
Share-Based Compensation
Restricted shares and restricted share units outstanding (in shares)		520,000		520,000
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)		150,000		150,000
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)		2,700,000		2,700,000
Share Repurchase Programs
Share Repurchase Program
Number of shares of common stock purchased (in shares)		300,000	21,000	600,000	800,000
Average purchase price per share (in usd per share) \| $ / shares		$ 20.24	$ 30.93	$ 21.03	$ 27.48
Black-Scholes
Assumptions used to determine the fair value of options as of the grant date
Expected dividend yield					0.00%
Black-Scholes \| Minimum
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)					2.66%
Expected stock price volatility (%)					70.31%
Expected option life (in years)					6 years
Fair value \| $ / shares			16.17		$ 16.17
Black-Scholes \| Maximum
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)					2.98%
Expected stock price volatility (%)					71.86%
Expected option life (in years)					6 years 3 months
Fair value \| $ / shares			19.06		$ 19.06
Binomial
Assumptions used to determine the fair value of options as of the grant date
Expected dividend yield					0.00%
Binomial \| Minimum
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)					1.64%
Expected stock price volatility (%)					71.81%
Expected option life (in years)					2 years 6 months 22 days
Fair value \| $ / shares			14.67		$ 14.67
Binomial \| Maximum
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)					2.83%
Expected stock price volatility (%)					71.86%
Expected option life (in years)					4 years 3 months 26 days
Fair value \| $ / shares			$ 18.28		$ 18.28