CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED STATEMENTS OF INCOME
Net revenues	$ 592,298	$ 542,782	$ 1,172,497	$ 1,073,623
Reimbursable out-of-pocket expenses	51,678	42,263	105,814	85,330
Total revenues	643,976	585,045	1,278,311	1,158,953
Costs and expenses:
Cost of revenue (excluding depreciation and amortization)	419,115	408,198	830,459	784,658
Reimbursable out-of-pocket expenses	51,678	42,263	105,814	85,330
Selling, general and administrative (excluding depreciation and amortization)	90,177	90,601	179,396	171,630
Depreciation and amortization	31,496	29,953	62,881	57,183
Goodwill impairment charge	0	17,959	0	17,959
Total costs and expenses	592,466	588,974	1,178,550	1,116,760
Income (loss) from operations	51,510	(3,929)	99,761	42,193
Other (income) expense, net:
Interest income	(513)	(526)	(1,139)	(1,038)
Interest expense	1,517	1,466	3,014	2,471
Foreign exchange transaction loss, net	694	792	1,029	1,020
Gain on sale of investments	(707)	0	(16,400)	0
Impairment of equity investment	0	7,373	0	7,373
Loss on sale of business	0	169	0	169
Other (income) expense, net	991	9,274	(13,496)	9,995
Income (loss) before taxes and equity investee earnings	50,519	(13,203)	113,257	32,198
Tax expense (benefit)	9,525	(607)	24,097	9,200
Equity investee (loss) earnings	0	(81)	0	17
Net income (loss)	$ 40,994	$ (12,677)	$ 89,160	$ 23,015
Basic earnings (loss) per share	$ 0.75	$ (0.23)	$ 1.64	$ 0.41
Weighted average shares outstanding - basic	54,662,093	54,184,966	54,434,563	55,965,410
Diluted earnings (loss) per share	$ 0.72	$ (0.23)	$ 1.58	$ 0.40
Weighted average shares outstanding - diluted	56,880,115	54,184,966	56,598,936	57,456,154