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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock [Member]
Numerator [Abstract]
Distributed earnings									$ 32,595	$ 10,473	$ 27,674
Undistributed earnings									(4,741)	8,896	(1,869)
Basic									27,854	19,369	25,805
Class A Common earnings									2,453	1,706	2,551
Diluted									$ 30,307	$ 21,075	$ 28,356
Denominator [Abstract]
Weighted average shares outstanding - basic (in shares)									19,182	19,381	19,492
Assumed conversion of Class A Common Stock (in shares)									1,765	1,801	2,014
Dilutive options, awards and common stock equivalents (in shares)									348	417	341
Total weighted average diluted Common Stock (in shares)									21,295	21,599	21,847
Basic net earnings per share [Abstract]
Common stock (in dollars per share)	$ 0.46	$ 0.40	$ 0.30	$ 0.30	$ 0.14	$ 0.28	$ 0.29	$ 0.28	$ 1.45	$ 1.00	$ 1.32
Diluted net earnings per share [Abstract]
Common stock (in dollars per share)	0.45	0.39	0.29	0.29	0.13	0.28	0.29	0.28	$ 1.42	$ 0.98	$ 1.30
Class A Common Stock [Member]
Numerator [Abstract]
Distributed earnings									$ 2,869	$ 919	$ 2,735
Undistributed earnings									(416)	787	(184)
Class A Common earnings									$ 2,453	$ 1,706	$ 2,551
Denominator [Abstract]
Weighted average shares outstanding (in shares)									1,765	1,801	2,014
Basic net earnings per share [Abstract]
Common stock (in dollars per share)	0.44	0.38	0.28	0.28	0.13	0.27	0.28	0.27	$ 1.39	$ 0.95	$ 1.27
Diluted net earnings per share [Abstract]
Common stock (in dollars per share)	$ 0.45	$ 0.38	$ 0.28	$ 0.28	$ 0.13	$ 0.27	$ 0.27	$ 0.27	$ 1.39	$ 0.94	$ 1.27

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