CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Thousands	Total	Comprehensive Income [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Additional Paid-in Capital (APIC) [Member]	Class A [Member]	Class B [Member]
Balance at Dec. 31, 2010	$ 220,333		$ 195,477	$ (39)	$ 23,725	$ 217	$ 953
Cash dividends declared on Class A common stock	(261)		(261)
Cash dividends declared on Class B common stock	(1,333)		(1,333)
Issuance of restricted common stock	0				(13)		13
Termination of restricted common stock	0				1		(1)
Currency translation adjustment	938	938		938
Unrealized holding losses on marketable securities arising during the year, net of taxes of ($71)	(119)	(119)		(119)
Reclassification adjustment for gains included in net earnings, net of taxes of ($45)	(74)	(74)
Stock-based compensation expense	817				817
Net earnings	2,670	2,670	2,670
Comprehensive income		3,415
Balance at Jun. 30, 2011	$ 222,971		$ 196,553	$ 706	$ 24,530	$ 217	$ 965