Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 31,601	$ 30,343
Short-term investments	50	50
Investment in marketable securities	972	648
Accounts receivable, less allowance for doubtful accounts of $555 and $515, respectively	34,525	37,236
Inventory	10,893	4,698
Prepaid income taxes	3,216	1,988
Prepaid expenses and other	5,886	4,393
Deferred income taxes	3,431	3,431
Total current assets	90,574	82,787
Property and equipment, net	47,767	42,615
Goodwill	77,357	71,637
Intangible assets	15,702	17,187
Other assets	680	609
Total assets	232,080	214,835
Current Liabilities:
Accounts payable	5,569	7,136
Accrued expenses	13,731	16,162
Deferred revenues	13,588	11,670
Total current liabilities	32,888	34,968
Deferred rent	2,397	2,368
Deferred income taxes	4,098	3,703
Long-term debt	21,000	21,000
Other liabilities	2,146	2,141
Total liabilities	62,529	64,180
Commitments and contingencies
Stockholders' Equity:
Preferred stock - $10.00 par value, 500,000 shares authorized, none issued and outstanding	0	0
Common stock - $.01 par value, 175,000,000 shares authorized, 60,807,913 and 60,460,782 shares issued, respectively	608	605
Additional paid-in capital	102,548	100,441
Accumulated other comprehensive (loss) income	10,413	(1,545)
Retained earnings	135,911	131,037
Treasury stock, 11,596,966 and 11,589,603 shares at cost, respectively	(79,929)	(79,883)
Total stockholders' equity	169,551	150,655
Total liabilities and stockholders' equity	$ 232,080	$ 214,835