Consolidated Statements of Stockholders' Equity (USD $)	Total USD ($)	Class A	Class B USD ($)	Class A common stock Class A USD ($)	Class A common stock Class B USD ($)	Treasury stock USD ($)	Additional paid-in capital USD ($)	Accumulated deficit USD ($)
Beginning Balance at Dec. 31, 2010	$ 139,692,000			$ 105,000	$ 255,000	$ (1,360,000)	$ 281,421,000	$ (140,729,000)
Beginning Balance, share at Dec. 31, 2010						(223,000)
Beginning Balance (in shares) at Dec. 31, 2010				10,238,000	25,480,000
Issuance of common stock upon exercise of stock options (in shares)	410,662				411,000
Issuance of common stock upon exercise of stock options	1,757,000				4,000		1,753,000
Income tax benefit of option exercises and restricted stock vesting, net	913,000						913,000
Issuance of common stock upon vesting of restricted stock units					462,000
Issuance of restricted stock to employees as part of acquisitions	5,000				5,000
Issuance of restricted stock to employees (in shares)					1,103,000
Issuance of restricted stock to employees	11,000				11,000
Issuance of common stock in connection with acquisition	7,603,000				10,000		7,593,000
Issuance of common stock in connection with acquisition (in shares)					1,019,000
Issuance of common stock under employee stock purchase plan (in shares)					4,000
Issuance of common stock under employee stock purchase plan	26,000						26,000
Income tax shortfall of option exercises, restricted stock vesting and other, net	913,000
Repurchase of Class B common stock, shares			(883,000)			(883,000)
Repurchase of Class B common stock	(6,159,000)		(6,200,000)			(6,159,000)
Conversion of Class A common stock to Class B common stock (in shares)				(606,000)	606,000
Conversion of Class A common stock to Class B common stock				(6,000)	6,000
Repurchase of unvested restricted stock, shares						(62,000)
Repurchase of unvested restricted stock	(1,000)					(1,000)
Stock compensation from options and restricted stock, net of estimated forfeitures	15,140,000						15,140,000
Retirement of treasury stock (in shares)					(1,011,000)	1,011,000
Retirement of treasury stock					(10,000)	6,453,000	(6,443,000)
Net income (loss)	2,959,000							2,959,000
Common stock cash dividends	(2,938,000)						(2,938,000)
Ending Balance at Dec. 31, 2011	159,008,000			99,000	281,000	(1,067,000)	297,465,000	(137,770,000)
Ending Balance, share at Dec. 31, 2011						(157,000)
Ending Balance (in shares) at Dec. 31, 2011				9,632,000	28,074,000
Issuance of common stock upon exercise of stock options (in shares)	6,556				6,000
Issuance of common stock upon exercise of stock options	27,000						27,000
Issuance of restricted stock to employees (in shares)					1,484,000
Issuance of restricted stock to employees	15,000				15,000
Issuance of common stock under employee stock purchase plan (in shares)					10,000
Issuance of common stock under employee stock purchase plan	36,000						36,000
Income tax shortfall of option exercises, restricted stock vesting and other, net	(4,006,000)						(4,006,000)
Tax withholding related to restricted stock awards, Shares					(7,000)	(384,000)
Tax withholding related to restricted stock awards	(1,611,000)					(4,000)	(1,607,000)
Repurchase of Class B common stock, shares			(387,000)			(387,000)
Repurchase of Class B common stock	(1,651,000)		(1,700,000)			(1,651,000)
Conversion of Class A common stock to Class B common stock (in shares)				(62,000)	62,000
Conversion of Class A common stock to Class B common stock				(1,000)	1,000
Repurchase of unvested restricted stock, shares						(723,000)
Repurchase of unvested restricted stock	(7,000)					(7,000)
Stock compensation from options and restricted stock, net of estimated forfeitures	15,696,000						15,696,000
Retirement of treasury stock (in shares)			1,200,000		(1,249,000)	1,249,000
Retirement of treasury stock					(13,000)	2,716,000	(2,703,000)
Net income (loss)	(35,196,000)							(35,196,000)
Common stock cash dividends	(9,376,000)						(9,376,000)
Ending Balance at Dec. 31, 2012	122,935,000			98,000	284,000	(13,000)	295,532,000	(172,966,000)
Ending Balance, share at Dec. 31, 2012			(402,000)			(402,000)
Ending Balance (in shares) at Dec. 31, 2012		9,570,000	27,978,000	9,570,000	28,380,000
Issuance of common stock upon exercise of stock options (in shares)	560,496				560,000
Issuance of common stock upon exercise of stock options	2,931,000				6,000		2,925,000
Issuance of common stock upon vesting of restricted stock units					71,000
Issuance of restricted stock to employees (in shares)					735,000
Issuance of restricted stock to employees	7,000				7,000
Issuance of common stock under employee stock purchase plan (in shares)					12,000
Issuance of common stock under employee stock purchase plan	72,000						72,000
Income tax shortfall of option exercises, restricted stock vesting and other, net	(384,000)						(384,000)
Tax withholding related to restricted stock awards, Shares						(220,000)
Tax withholding related to restricted stock awards	(1,766,000)					(2,000)	(1,764,000)
Repurchase of Class B common stock, shares			(31,000)			(31,000)
Repurchase of Class B common stock	(119,000)		(119,000)			(119,000)
Conversion of Class A common stock to Class B common stock (in shares)				(1,800,000)	1,800,000
Conversion of Class A common stock to Class B common stock				(18,000)	18,000
Repurchase of unvested restricted stock, shares						(185,000)
Repurchase of unvested restricted stock	(2,000)					(2,000)
Stock compensation from options and restricted stock, net of estimated forfeitures	9,264,000						9,264,000
Retirement of treasury stock (in shares)			679,000		(679,000)	679,000
Retirement of treasury stock					(6,000)	134,000	(128,000)
Net income (loss)	1,817,000							1,817,000
Ending Balance at Dec. 31, 2013	$ 134,755,000			$ 80,000	$ 309,000	$ (2,000)	$ 305,517,000	$ (171,149,000)
Ending Balance, share at Dec. 31, 2013			(159,000)			(159,000)
Ending Balance (in shares) at Dec. 31, 2013		7,770,000	30,720,000	7,770,000	30,879,000