Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data	Jun. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Accounts receivable, reserve for credit losses	$ 10,880	$ 10,237
Property, equipment and capitalized software, accumulated depreciation	$ 98,213	$ 88,970
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	175,000	175,000
Common stock, shares issued	42,226	41,924
Common stock, shares outstanding	38,661	38,437
Treasury stock, shares	3,566	3,566