Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 120,377	$ 158,017
Accounts receivable, net	249,351	236,099
Prepaids and other current assets	57,602	52,332
Deferred tax assets, net	13,283	11,905
Income tax receivable	8,748	11,198
Total current assets	449,361	469,551
Long-term assets
Property, plant and equipment, net	132,789	126,719
Goodwill	110,553	102,743
Contract acquisition costs, net	1,327	1,642
Deferred tax assets, net	40,069	42,791
Other intangible assets, net	56,394	54,812
Other long-term assets	41,447	44,084
Total long-term assets	382,579	372,791
Total assets	831,940	842,342
Current liabilities
Accounts payable	40,695	32,031
Accrued employee compensation and benefits	63,698	80,130
Other accrued expenses	40,216	31,659
Income taxes payable	1,648	6,066
Deferred tax liabilities, net	38	590
Deferred revenue	27,985	28,799
Other current liabilities	13,940	11,512
Total current liabilities	188,220	190,787
Long-term liabilities
Line of credit	100,000	100,000
Deferred tax liabilities, net	2,103	2,281
Deferred rent	9,040	9,635
Other long-term liabilities	60,799	63,648
Total long-term liabilities	171,942	175,564
Total liabilities	360,162	366,351
Commitments and contingencies (Note 10)
Mandatorily redeemable noncontrolling interest	2,462	2,509
Stockholders' equity
Preferred stock - $0.01 par value: 10,000,000 shares authorized; zero shares outstanding as of March 31, 2014 and December 31, 2013	0	0
Common stock - $0.01 par value; 150,000,000 shares authorized; 49,714,740 and 50,352,881 shares outstanding as of March 31, 2014 and December 31, 2013, respectively	497	503
Additional paid-in capital	352,568	356,381
Treasury stock at cost: 32,513,513 and 31,699,372 shares as of March 31, 2014 and December 31, 2013, respectively	(494,133)	(477,399)
Accumulated other comprehensive income	(24,602)	(20,586)
Retained earnings	626,895	606,502
Noncontrolling interest	8,091	8,081
Total stockholders' equity	469,316	473,482
Total liabilities and stockholders' equity	$ 831,940	$ 842,342