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Represents the percentage of compounded annual gain of stock price over exercise price required for the award to vest.

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Share-based Compensation Arrangement By Share-based Payment Award, Allowable Performance Period Before Expiration Date

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Share-based Compensation Arrangement by Share-based Payment Award, Alternate Award Vesting Period

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Attainment Exceeds Target, Vesting, Percentage

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The maximum cost per share authorized by an entity's Board of Directors for shares to be repurchased under a stock repurchase plan.

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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 unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of share-based compensation awards.

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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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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of increase (decrease) of non-vested options.

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

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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SHAREHOLDERS’ EQUITY AND SHARE-BASED COMPENSATION Stock Repurchase Plan & Share-Based Compensation (Details)		1 Months Ended	3 Months Ended
	May 17, 2017 $ / shares shares	Feb. 28, 2019 shares	Mar. 31, 2019 USD ($) component $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2018 shares
Share Repurchase Program
Authorized amount (in dollars) \| $			$ 107,000,000
Capacity available to repurchase common stock under senior secured term loan (in dollars) \| $			459,000,000
Share-Based Compensation
Share-based compensation expense \| $			2,621,000	$ 2,201,000
Estimated unrecognized compensation costs (in dollars) \| $			$ 17,300,000
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized			1 year 10 months 13 days
Outstanding (in shares)			1,641,332		1,440,566
Stock options granted (in shares)				261,000
Weighted average exercise price of stock options granted (in usd per share) \| $ / shares				$ 24.95
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	$ 16.20
Intrinsic value of options exercised \| $			$ 10,000	$ 4,320,000
Grant date fair value of stock options that vested \| $			$ 2,182,000	$ 23,000
Employee and non-employee stock options
Share-Based Compensation
Stock options granted (in shares)			0
Employee and non-employee stock options \| Service-Based
Share-Based Compensation
Outstanding (in shares)			497,000
Employee and non-employee stock options \| Service-Based \| Minimum
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award vesting period			3 years
Employee and non-employee stock options \| Service-Based \| Maximum
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award vesting period			4 years
Expiration term			10 years
Employee and non-employee stock options \| Market-Based
Share-Based Compensation
Outstanding (in shares)			638,000
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
Share-based compensation arrangement by share-based payment award, award vesting period			3 years
Expiration term			10 years
Employee and non-employee stock options \| Market-Based \| Maximum
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award 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)			506,000
Increase in outstanding options, due to level of achievement (in shares)		228,000
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
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage			25.00%
Employee and non-employee stock options \| Performance-Based, Vesting Period Two
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage			25.00%
Employee and non-employee stock options \| Performance-Based, Vesting Period Three
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage			25.00%
Employee and non-employee stock options \| Performance-Based, Vesting Period Four
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage			25.00%
Restricted Stock \| Performance-Based, Vesting Period One
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage			33.00%
Restricted Stock \| Performance-Based, Vesting Period Two
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage			33.00%
Restricted Stock \| Performance-Based, Vesting Period Three
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage			33.00%
Restricted Stock And Restricted Stock Units (RSUs)
Share-Based Compensation
Restricted shares and restricted share units outstanding (in shares)			770,528		485,806
Restricted Stock And Restricted Stock Units (RSUs) \| Service-Based
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, alternate award vesting period			2 years
Restricted shares and restricted share units outstanding (in shares)			631,000
Restricted Stock And Restricted Stock Units (RSUs) \| Service-Based \| Minimum
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award vesting period			1 year
Restricted Stock And Restricted Stock Units (RSUs) \| Service-Based \| Maximum
Share-Based Compensation
Share-based compensation arrangement by share-based payment award, award 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)			140,000
Restricted Stock And Restricted Stock Units (RSUs) \| Performance-Based \| Maximum
Share-Based Compensation
Attainment above threshold performance levels, vesting percentage			225.00%
Restricted Stock Units (RSUs)
Share-Based Compensation
Restricted share units granted (in shares)			358,978
Restricted share units granted, weighted average grant date fair value (in usd per share) \| $ / shares			$ 25.02
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)			3,400,000
Share Repurchase Programs
Share Repurchase Program
Number of shares of common stock purchased (in shares)			0	400,000
Average purchase price per share (in usd per share) \| $ / shares				$ 27.67
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
Black-Scholes \| Maximum
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)				2.70%
Expected stock price volatility (%)				71.81%
Expected option life (in years)				6 years 3 months
Fair value \| $ / shares				$ 17.15
Binomial
Assumptions used to determine the fair value of options as of the grant date
Expected stock price volatility (%)				7181.00%
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 (%)				1.65%
Expected option life (in years)				2 years 6 months 22 days
Fair value \| $ / shares				$ 15.58
Binomial \| Maximum
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (%)				2.77%
Expected option life (in years)				4 years 3 months 26 days
Fair value \| $ / shares				$ 18.28