Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 97,778	$ 158,017
Accounts receivable, net	251,436	236,099
Prepaids and other current assets	59,515	52,332
Deferred tax assets, net	11,731	11,905
Income tax receivable	10,821	11,198
Total current assets	431,281	469,551
Long-term assets
Property, plant and equipment, net	141,381	126,719
Goodwill	110,781	102,743
Contract acquisition costs, net	1,043	1,642
Deferred tax assets, net	33,740	42,791
Other intangible assets, net	54,190	54,812
Other long-term assets	44,221	44,084
Total long-term assets	385,356	372,791
Total assets	816,637	842,342
Current liabilities
Accounts payable	28,675	32,031
Accrued employee compensation and benefits	69,216	80,130
Other accrued expenses	28,441	31,659
Income taxes payable	2,851	6,066
Deferred tax liabilities, net	35	590
Deferred revenue	23,046	28,799
Other current liabilities	9,641	11,512
Total current liabilities	161,905	190,787
Long-term liabilities
Line of credit	100,000	100,000
Deferred tax liabilities, net	3,342	2,281
Deferred rent	8,726	9,635
Other long-term liabilities	50,882	63,648
Total long-term liabilities	162,950	175,564
Total liabilities	324,855	366,351
Commitments and contingencies (Note 10)
Mandatorily redeemable noncontrolling interest	3,274	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	492	503
Additional paid-in capital	352,920	356,381
Treasury stock at cost: 32,513,513 and 31,699,372 shares as of March 31, 2014 and December 31, 2013, respectively	(508,627)	(477,399)
Accumulated other comprehensive income	(6,357)	(20,586)
Retained earnings	641,852	606,502
Noncontrolling interest	8,228	8,081
Total stockholders' equity	488,508	473,482
Total liabilities and stockholders' equity	$ 816,637	$ 842,342