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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Total	Class A and B Common Stock [Member]	Additional Paid-in Capital [Member]	Purchase Price Of Excess Of Predecessor Basis, Net Of Tax [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2015	$ 647,840	$ 419	$ 174,285	$ (15,458)	$ 660,758	$ (178)	$ (171,986)
Beginning Balance (in shares) at Dec. 31, 2015		41,887,088					(5,590,831)
Purchase of treasury shares	(100,000)						$ (100,000)
Purchase of treasury shares (in shares)							(2,672,227)
Stock tendered for payments of withholding taxes	(2,489)						$ (2,489)
Stock tendered for payments of withholding taxes (in shares)							(73,546)
Issuance of restricted stock awards, net of forfeitures			(8,838)				$ 8,838
Issuance of restricted stock awards, net of forfeitures (in shares)							304,794
Share-based compensation expense	8,479		8,479
Tax benefit of share-based compensation plans	(361)		(361)
Net income	74,805				74,805
Foreign currency translation adjustment	(95)					(95)
Ending Balance at Dec. 31, 2016	628,179	$ 419	173,565	(15,458)	735,563	(273)	$ (265,637)
Ending Balance (in shares) at Dec. 31, 2016		41,887,088					(8,031,810)
Stock tendered for payments of withholding taxes	(3,412)						$ (3,412)
Stock tendered for payments of withholding taxes (in shares)							(77,988)
Issuance of restricted stock awards, net of forfeitures			(10,427)				$ 10,427
Issuance of restricted stock awards, net of forfeitures (in shares)							332,076
Share-based compensation expense	9,873		9,873
Net income	135,153				135,153
Foreign currency translation adjustment	79					79
Ending Balance at Dec. 31, 2017	769,872	$ 419	173,011	(15,458)	870,716	(194)	$ (258,622)
Ending Balance (in shares) at Dec. 31, 2017		41,887,088					(7,777,722)
Stock tendered for payments of withholding taxes	(4,270)						$ (4,270)
Stock tendered for payments of withholding taxes (in shares)							(87,381)
Issuance of restricted stock awards, net of forfeitures			(14,271)				$ 14,271
Issuance of restricted stock awards, net of forfeitures (in shares)							434,020
Share-based compensation expense	13,480		13,480
Net income	201,740				201,740
Foreign currency translation adjustment	12					12
Ending Balance at Dec. 31, 2018	$ 980,834	$ 419	$ 172,220	$ (15,458)	$ 1,072,456	$ (182)	$ (248,621)
Ending Balance (in shares) at Dec. 31, 2018		41,887,088					(7,431,083)

X

- Definition

Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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