Condensed Consolidated Balance Sheets - Unaudited (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Trade accounts receivable-billed, allowance	$ 3,043	$ 3,147
Property and equipment, net of depreciation	132,020	120,643
Software, net of amortization	77,106	68,496
Client contracts, net of amortization	74,137	182,182
Long-term debt, unamortized original issue discount	$ 21,327	$ 25,302
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000	100,000
Common stock, shares outstanding	33,839	33,734
Treasury stock, shares	32,030	31,530