CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Comprehensive (Loss) 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, 2008	$ 217,773		$ 196,467	$ 188	$ 218	$ 937	$ 19,963
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on Class A common stock	(521)		(521)
Cash dividends declared on Class B common stock	(2,622)		(2,622)
Issuance of restricted common stock	0					14	(14)
Termination of restricted common stock	0					(2)	2
Repurchase/retirement of Class A common stock	(92)				(1)		(91)
Foreign currency translation adjustment	43	43		43
Unrealized holding gains on marketable securities arising during the year	4,321	4,321		4,321
Reclassification adjustment of unrealized holding gains included in net earnings/loss	(4,289)	(4,289)		(4,289)
Reduction in APIC pool associated with tax deficiencies related to restricted stock awards	(287)						(287)
Unauthorized issuance of common stock	812						812
Return of unauthorized shares of common stock	(456)					(3)	(453)
Stock-based compensation expense	1,731						1,731
Change in unfunded SERP liability, net of taxes	829	829		829
Net earnings (loss)	(8,310)	(8,310)	(8,310)
Comprehensive income (loss)		(7,406)
Balance at Dec. 31, 2009	208,932		185,014	1,092	217	946	21,663
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on Class A common stock	(522)		(522)
Cash dividends declared on Class B common stock	(2,664)		(2,664)
Issuance of restricted common stock	0					7	(7)
Foreign currency translation adjustment	(907)	(907)		(907)
Unrealized holding gains on marketable securities arising during the year	457	457		457
Reduction in APIC pool associated with tax deficiencies related to restricted stock awards	(131)						(131)
Stock-based compensation expense	2,200						2,200
Change in unfunded SERP liability, net of taxes	(681)	(681)		(681)
Net earnings (loss)	13,649	13,649	13,649
Comprehensive income (loss)		12,518
Balance at Dec. 31, 2010	220,333		195,477	(39)	217	953	23,725
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared on Class A common stock	(522)		(522)
Cash dividends declared on Class B common stock	(2,690)		(2,690)
Issuance of restricted common stock	0					13	(13)
Termination of restricted common stock	0					(2)	2
Foreign currency translation adjustment	(236)	(236)		(236)
Unrealized holding gains on marketable securities arising during the year	(507)	(507)		(507)
Reclassification adjustment of unrealized holding gains included in net earnings/loss	(74)	(74)		(74)
Reduction in APIC pool associated with tax deficiencies related to restricted stock awards	(3)						(3)
Stock-based compensation expense	1,709						1,709
Change in unfunded SERP liability, net of taxes	(694)	(694)		(694)
Net earnings (loss)	3,764	3,764	3,764
Comprehensive income (loss)		2,253
Balance at Dec. 31, 2011	$ 221,080		$ 196,029	$ (1,550)	$ 217	$ 964	$ 25,420