Condensed Consolidated Statement of Shareowners' Equity (unaudited) Statement - USD ($) $ in Thousands	Total	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Shareowners’ Equity at Jun. 30, 2018	$ 193,024	$ 13	$ 2,138	$ 1,881	$ 249,945	$ 1,816	$ (62,769)
Net income	20,281				20,281
Other Comprehensive Income (Loss), Net of Tax	45					45
Issuance of non-restricted stock (6,000 shares in Q2'20, 9,000 shares in Q2'19, 15,000 shares YTD in FY'20, 21,000 shares YTD in FY'19)	(12)			(288)			276
Conversion of Class A to Class B common stock (55,000 shares in Q2'20, 7,000 shares in Q2'19, 57,000 shares YTD in FY'20, 7,000 shares YTD in FY'19)	0	0	0
Compensation expense related to stock incentive plans	3,628			3,628
Performance share issuance (0 shares in Q2'20, 0 shares in Q2'19, 67,000 shares YTD in FY'20, 81,000 shares YTD in FY'19)	(652)			(1,709)	0		1,057
Restricted share units issuance (0 shares in Q2'20, 15,000 shares in Q2'19, 0 shares YTD in FY'20, 15,000 shares YTD in FY'19)	(181)			(382)			201
Relative total shareholder return performance units issuance (0 shares in Q2'20, 0 shares in Q2'19, 48,000 shares YTD in FY'20, 27,000 shares YTD in FY'19)	(173)			(523)			350
Repurchase of Common Stock (65,000 shares in Q2'20, 371,000 shares in Q2'19, 65,000 shares YTD in FY'20, 567,000 shares YTD in FY'19)	(9,130)						(9,130)
Dividends declared ($0.09 per share in Q2'20, $0.08 per share in Q2'19, $0.18 per share YTD in FY'20, $0.16 per share YTD in FY'19)	(5,959)				(5,959)
Shareowners’ Equity at Dec. 31, 2018	200,871	13	2,138	2,607	264,267	1,861	(70,015)
Shareowners’ Equity at Sep. 30, 2018	198,684	13	2,138	1,431	257,825	1,788	(64,511)
Net income	9,405				9,405
Other Comprehensive Income (Loss), Net of Tax	73					73
Issuance of non-restricted stock (6,000 shares in Q2'20, 9,000 shares in Q2'19, 15,000 shares YTD in FY'20, 21,000 shares YTD in FY'19)	0			(125)			125
Conversion of Class A to Class B common stock (55,000 shares in Q2'20, 7,000 shares in Q2'19, 57,000 shares YTD in FY'20, 7,000 shares YTD in FY'19)	0	0	0
Compensation expense related to stock incentive plans	1,683			1,683
Restricted share units issuance (0 shares in Q2'20, 15,000 shares in Q2'19, 0 shares YTD in FY'20, 15,000 shares YTD in FY'19)	(181)			(382)			201
Repurchase of Common Stock (65,000 shares in Q2'20, 371,000 shares in Q2'19, 65,000 shares YTD in FY'20, 567,000 shares YTD in FY'19)	(5,830)						(5,830)
Dividends declared ($0.09 per share in Q2'20, $0.08 per share in Q2'19, $0.18 per share YTD in FY'20, $0.16 per share YTD in FY'19)	(2,963)				(2,963)
Shareowners’ Equity at Dec. 31, 2018	200,871	13	2,138	2,607	264,267	1,861	(70,015)
Shareowners’ Equity at Jun. 30, 2019	216,490	12	2,139	3,570	277,391	1,937	(68,559)
Net income	22,423				22,423
Other Comprehensive Income (Loss), Net of Tax	183					183
Issuance of non-restricted stock (6,000 shares in Q2'20, 9,000 shares in Q2'19, 15,000 shares YTD in FY'20, 21,000 shares YTD in FY'19)	0			(202)			202
Conversion of Class A to Class B common stock (55,000 shares in Q2'20, 7,000 shares in Q2'19, 57,000 shares YTD in FY'20, 7,000 shares YTD in FY'19)	0	(2)	2
Compensation expense related to stock incentive plans	3,080			3,080
Performance share issuance (0 shares in Q2'20, 0 shares in Q2'19, 67,000 shares YTD in FY'20, 81,000 shares YTD in FY'19)	(512)			(1,391)			879
Relative total shareholder return performance units issuance (0 shares in Q2'20, 0 shares in Q2'19, 48,000 shares YTD in FY'20, 27,000 shares YTD in FY'19)	(330)			(954)			624
Reclassification of equity-classified awards	(680)			(680)
Repurchase of Common Stock (65,000 shares in Q2'20, 371,000 shares in Q2'19, 65,000 shares YTD in FY'20, 567,000 shares YTD in FY'19)	(1,340)						(1,340)
Dividends declared ($0.09 per share in Q2'20, $0.08 per share in Q2'19, $0.18 per share YTD in FY'20, $0.16 per share YTD in FY'19)	(6,725)				(6,725)
Shareowners’ Equity at Dec. 31, 2019	232,589	10	2,141	3,423	293,089	2,120	(68,194)
Shareowners’ Equity at Sep. 30, 2019	225,032	12	2,139	2,438	285,405	1,976	(66,938)
Net income	11,039				11,039
Other Comprehensive Income (Loss), Net of Tax	144					144
Issuance of non-restricted stock (6,000 shares in Q2'20, 9,000 shares in Q2'19, 15,000 shares YTD in FY'20, 21,000 shares YTD in FY'19)	0			(84)			84
Conversion of Class A to Class B common stock (55,000 shares in Q2'20, 7,000 shares in Q2'19, 57,000 shares YTD in FY'20, 7,000 shares YTD in FY'19)	0	(2)	2
Compensation expense related to stock incentive plans	1,069			1,069
Repurchase of Common Stock (65,000 shares in Q2'20, 371,000 shares in Q2'19, 65,000 shares YTD in FY'20, 567,000 shares YTD in FY'19)	(1,340)						(1,340)
Dividends declared ($0.09 per share in Q2'20, $0.08 per share in Q2'19, $0.18 per share YTD in FY'20, $0.16 per share YTD in FY'19)	(3,355)				(3,355)
Shareowners’ Equity at Dec. 31, 2019	$ 232,589	$ 10	$ 2,141	$ 3,423	$ 293,089	$ 2,120	$ (68,194)