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EARNINGS PER SHARE (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Numerator:
Net income	$ 12,386	$ 22,302	$ 22,587	$ 20,096
Denominators:
Shares to be issued - acquisition	36	0	36	0
Unvested restricted stock (in shares)	(9)	(32)	(9)	(32)
Effect of weighted average shares outstanding (in shares)	(117)	(109)	(778)	(283)
Weighted average common shares outstanding, basic	47,690	42,779	47,029	42,605
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards (in shares)	671	1,396	631	1,333
Weighted average common shares outstanding, diluted	48,361	44,175	47,660	43,938
Anti-dilutive potentially issuable shares	2	0	2	2
Class A Common Stock
Denominators:
Common stock, shares outstanding	46,792	41,932	46,792	41,932	41,944
Class B Common Stock
Denominators:
Common stock, shares outstanding	988	988	988	988	988

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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