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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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EARNINGS PER COMMON SHARE (Narrative) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 02, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive awards	248,209		44,531
Antidilutive securities excluded from computation of earnings per share, amount	732,690	1,074,548	221,218
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01		$ 10.00
Potentially dilutive securities	371,893	1,114,103	268,538
Common Class A [Member] \| Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	660,999	485,223	268,066
Common Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock, par value (in dollars per share)				$ 0.01
Participating securities, distributed and undistributed earnings (loss), diluted	0
Potentially dilutive securities		0
Weighted Average [Member] \| Common Class A [Member] \| Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Participating securities, distributed and undistributed earnings (loss), diluted	32,120	54,993	52,730