CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
REVENUES
Customer services	$ 384,870	$ 362,155	$ 1,067,615	$ 1,012,667
COSTS AND EXPENSES
Cost of services provided	188,810	181,135	532,760	511,102
Depreciation and amortization	11,437	10,076	32,259	29,738
Sales, general and administrative	118,679	113,028	329,785	321,680
Interest income, net	24	(101)	(138)	(273)
INCOME BEFORE INCOME TAXES	65,920	58,017	172,949	150,420
PROVISION FOR INCOME TAXES	24,799	21,817	65,202	55,047
NET INCOME	$ 41,121	$ 36,200	$ 107,747	$ 95,373
NET INCOME PER SHARE - BASIC AND DILUTED (in dollars per share)	$ 0.28	$ 0.25	$ 0.74	$ 0.65
DIVIDENDS PAID PER SHARE (in dollars per share)	$ 0.105	$ 0.09	$ 0.315	$ 0.27
Weighted average participating shares outstanding - basic and diluted (in shares)	145,800	146,007	145,888	146,151