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EARNINGS PER SHARE (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Numerator:
Net income (loss)	$ 11,915	$ 1,704	$ 10,201	$ (2,206)
Number of shares outstanding, end of period:
Shares to be issued - acquisition (in shares)	36	0	36	0
Unvested restricted stock (in shares)	(9)	(38)	(9)	(38)
Effect of weighted average shares outstanding (in shares)	(150)	(54)	(921)	(199)
Basic weighted average common share outstanding (in shares)	47,464	42,661	46,693	42,516
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards (in shares)	757	1,255	731	0
Diluted weighted average shares outstanding (in shares)	48,221	43,916	47,424	42,516
Antidilutive potentially issuable shares (in shares)	0	0	154	2,105
Class A Common Stock
Number of shares outstanding, end of period:
Common stock, outstanding shares (in shares)	46,599	41,765	46,599	41,765	41,944
Class B Common Stock
Number of shares outstanding, end of period:
Common stock, outstanding shares (in shares)	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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Amount after tax of income (loss) from continuing operations attributable to the parent.

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