Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2015	$ 170	$ 24	$ 139,968	$ (3,408)	$ (17,544)	$ 82,950	$ 202,160
Net income						10,853	10,853
Other comprehensive income (loss)					9,575		9,575
Effect of adoption of ASU 2016-09						2,247	2,247
Exercise of stock options			(27)	59			32
Stock-based employee compensation cost			914				914
Issuance of restricted shares			(2,032)	1,651			(381)
Balance at Sep. 30, 2016	$ 170	$ 24	$ 138,823	$ (1,698)	$ (7,969)	$ 96,050	$ 225,400