Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 55,330	$ 60,304
Accounts receivable, net	261,569	283,474
Prepaids and other current assets	68,262	64,180
Income tax receivable	12,379	7,114
Total current assets	397,540	415,072
Long-term assets
Property, plant and equipment, net	170,124	168,289
Goodwill	114,092	114,183
Deferred tax assets, net	48,021	52,082
Other intangible assets, net	46,845	51,215
Other long-term assets	45,526	42,486
Total long-term assets	424,608	428,255
Total assets	822,148	843,327
Current liabilities
Accounts payable	41,724	43,323
Accrued employee compensation and benefits	60,877	71,634
Other accrued expenses	22,216	33,160
Income taxes payable	6,074	9,125
Deferred revenue	22,367	26,184
Other current liabilities	24,740	23,480
Total current liabilities	177,998	206,906
Long-term liabilities
Line of credit	135,000	100,000
Deferred tax liabilities, net	3,496	3,333
Deferred rent	11,821	11,791
Other long-term liabilities	69,634	76,349
Total long-term liabilities	219,951	191,473
Total liabilities	397,949	398,379
Commitments and contingencies (Note 10)
Mandatorily redeemable noncontrolling interest		4,131
Stockholders' equity
Common stock - $0.01 par value; 150,000,000 shares authorized; 47,319,652 and 48,481,323 shares outstanding as of June 30, 2016 and December 31, 2015, respectively	474	485
Additional paid-in capital	347,704	347,251
Treasury stock at cost: 34,732,601 and 33,570,930 shares as of June 30, 2016 and December 31, 2015, respectively	(566,980)	(533,744)
Accumulated other comprehensive income (loss)	(98,542)	(101,365)
Retained earnings	734,441	720,989
Noncontrolling interest	7,102	7,201
Total stockholders' equity	424,199	440,817
Total liabilities and stockholders' equity	$ 822,148	$ 843,327