Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 75,422	$ 60,304
Accounts receivable, net	286,165	283,474
Prepaids and other current assets	71,008	64,180
Income tax receivable	8,730	7,114
Total current assets	441,325	415,072
Long-term assets
Property, plant and equipment, net	169,551	168,289
Goodwill	114,506	114,183
Deferred tax assets, net	45,312	52,082
Other intangible assets, net	49,950	51,215
Other long-term assets	45,249	42,486
Total long-term assets	424,568	428,255
Total assets	865,893	843,327
Current liabilities
Accounts payable	39,247	43,323
Accrued employee compensation and benefits	69,034	71,634
Other accrued expenses	37,246	33,160
Income taxes payable	4,096	9,125
Deferred revenue	25,799	26,184
Other current liabilities	20,575	23,480
Total current liabilities	195,997	206,906
Long-term liabilities
Line of credit	133,000	100,000
Deferred tax liabilities, net	3,179	3,333
Deferred rent	12,083	11,791
Other long-term liabilities	66,012	76,349
Total long-term liabilities	214,274	191,473
Total liabilities	$ 410,271	$ 398,379
Commitments and contingencies (Note 10)
Mandatorily redeemable noncontrolling interest	$ 4,105	$ 4,131
Stockholders' equity
Common stock - $0.01 par value; 150,000,000 shares authorized; 48,231,632 and 48,481,323 shares outstanding as of March 31, 2016 and December 31, 2015, respectively	483	485
Additional paid-in capital	347,637	347,251
Treasury stock at cost: 33,820,621 and 33,570,930 shares as of March 31, 2016 and December 31, 2015, respectively	(541,187)	(533,744)
Accumulated other comprehensive income (loss)	(85,815)	(101,365)
Retained earnings	723,317	720,989
Noncontrolling interest	7,082	7,201
Total stockholders' equity	451,517	440,817
Total liabilities and stockholders' equity	$ 865,893	$ 843,327