Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 3,068	$ 6,406
Accounts receivable (less allowance for losses of $1,177 in 2013 and $1,621 in 2012)	121,256	99,212
Prepaid expenses	11,811	9,000
Other current assets	4,905	1,480
Deferred income taxes	5,512	5,544
Total current assets	146,552	121,642
Accounts receivable, long-term portion	800	1,187
Property and equipment, net	55,378	45,381
Non-current investments available-for-sale	2,103	2,037
Other assets:
Goodwill	121,011	121,011
Other intangibles, net	42,289	45,800
Sundry	795	1,197
Total assets	368,928	338,255
Current liabilities:
Accounts payable	3,776	3,167
Accrued liabilities	23,583	26,018
Deferred revenue	155,903	140,550
Total current liabilities	183,262	169,735
Revolving line of credit		18,000
Deferred income taxes	5,511	5,221
Commitments and contingencies
Shareholders' equity:
Preferred stock, $10.00 par value; 1,000,000 shares authorized, none issued
Common stock, $0.01 par value; 100,000,000 shares authorized; 48,147,969 shares issued in 2013 and 2012	481	481
Additional paid-in capital	159,164	154,018
Accumulated other comprehensive loss, net of tax	(209)	(268)
Retained earnings	180,649	163,109
Treasury stock, at cost; 16,321,141 and 16,816,903 shares in 2013 and 2012, respectively	(159,930)	(172,041)
Total shareholders' equity	180,155	145,299
Liabilities and Shareholders' equity, Total	$ 368,928	$ 338,255