Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Class A Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2010	$ 224	$ 200,205	$ 113,258	$ 11,247	$ (60,808)	$ 264,126
Balance (in shares) at Dec. 31, 2010	25,761,334
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	20,611	0	0	20,611
Foreign currency translation adjustment	0	0	0	(2,167)	0	(2,167)
Sale of Class A common stock	1	783	0	0	0	784
Sale of Class A common stock (in shares)	226,917
Tax benefit from stock options exercised	0	293	0	0	0	293
Stock issued under employee stock purchase plan	0	432	0	0	0	432
Stock issued under employee stock purchase plan (in shares)	33,348
Stock based compensation expense	0	2,098	0	0	0	2,098
Purchase of Class A treasury stock	0	0	0	0	(4,053)	(4,053)
Purchase of Class A treasury stock (in shares)	(322,241)
Issuance of Class A common stock under dividend reinvestment program	0	0	(51)	0	51	0
Issuance of Class A common stock under dividend reinvestment program (in shares)	3,767
Cash dividends	0	0	(8,199)	0	0	(8,199)
Balance at Dec. 31, 2011	225	203,811	125,619	9,080	(64,810)	273,925
Balance (in shares) at Dec. 31, 2011	25,703,125
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(23,416)	0	0	(23,416)
Foreign currency translation adjustment	0	0	0	2,779	0	2,779
Sale of Class A common stock	2	1,969	0	0	0	1,971
Sale of Class A common stock (in shares)	373,091
Tax benefit from stock options exercised	0	244	0	0	0	244
Stock issued under employee stock purchase plan	0	403	0	0	0	403
Stock issued under employee stock purchase plan (in shares)	33,058
Stock based compensation expense	0	3,129	0	0	0	3,129
Issuance of Class A common stock under dividend reinvestment program	0	0	(54)	0	54	0
Issuance of Class A common stock under dividend reinvestment program (in shares)	4,270
Cash dividends	0	0	(8,252)	0	0	(8,252)
Balance at Dec. 31, 2012	227	209,556	93,897	11,859	(64,756)	250,783
Balance (in shares) at Dec. 31, 2012	26,113,544					26,113,544
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			6,525			6,525
Foreign currency translation adjustment				(1,117)		(1,117)
Pension liability adjustment				(137)		(137)
Sale of Class A common stock	2	1,447				1,449
Sale of Class A common stock (in shares)	120,133
Tax benefit from stock options exercised		247				247
Stock issued under employee stock purchase plan		353				353
Stock issued under employee stock purchase plan (in shares)	28,211
Stock based compensation expense		1,644				1,644
Purchase of Class A treasury stock					(532)	(532)
Purchase of Class A treasury stock (in shares)	(39,739)
Issuance of Class A common stock under dividend reinvestment program			(54)		54	0
Issuance of Class A common stock under dividend reinvestment program (in shares)	4,154
Cash dividends			(8,368)			(8,368)
Balance at Dec. 31, 2013	$ 229	$ 213,247	$ 92,000	$ 10,605	$ (65,234)	$ 250,847
Balance (in shares) at Dec. 31, 2013	26,226,303					26,226,303