CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Trade accounts receivable-billed, allowance	$ 3,888	$ 3,735
Property and equipment, accumulated depreciation	97,700	98,029
Intangibles, accumulated amortization	222,528	219,204
Client contract costs, accumulated amortization	34,644	31,526
Long-term debt, unamortized discounts	$ 8,897	$ 10,053
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	33,075,000	32,891,000
Treasury stock, shares	35,498,000	35,356,000
Software
Intangibles, accumulated amortization	$ 128,662	$ 125,437
Acquired client contracts
Intangibles, accumulated amortization	$ 93,866	$ 93,767