CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Thousands	Total	Comprehensive Income [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Common Stock [Member] Class A [Member]	Common Stock [Member] Class B [Member]	Additional Paid-in Capital (APIC) [Member]
Balance at Dec. 31, 2010	$ 220,333		$ 195,477	$ (39)	$ 217	$ 953	$ 23,725
Cash dividends declared on Class A common stock	(391)		(391)
Cash dividends declared on Class B common stock	(2,003)		(2,003)
Issuance of restricted common stock	0					13	(13)
Termination of restricted common stock	0					(1)	1
Currency translation adjustment	350	350		350
Unrealized holding losses on marketable securities arising during the year, net of taxes of ($305)	(499)	(499)		(499)
Reclassification adjustment for gains included in net earnings, net of taxes of ($45)	(74)	(74)		(74)
Reduction in APIC pool associated with tax deficiencies related to restricted stock awards	(86)						(86)
Stock-based compensation expense	1,275						1,275
Net earnings	3,682	3,682	3,682
Comprehensive income		3,459
Balance at Sep. 30, 2011	$ 222,587		$ 196,765	$ (262)	$ 217	$ 965	$ 24,902