Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 89,046	$ 78,237
Accounts receivable, net	332,867	350,962
Prepaids and other current assets	91,468	88,487
Income tax receivable	9,270	8,791
Total current assets	522,651	526,477
Long-term assets
Property, plant and equipment, net	165,367	161,523
Operating lease assets	135,193
Goodwill	205,180	204,633
Deferred tax assets, net	16,717	15,523
Other intangible assets, net	78,532	80,911
Other long-term assets	65,002	65,441
Total long-term assets	665,991	528,031
Total assets	1,188,642	1,054,508
Current liabilities
Accounts payable	59,877	59,447
Accrued employee compensation and benefits	101,743	83,437
Other accrued expenses	30,688	15,963
Income taxes payable	19,135	12,325
Deferred revenue	40,369	44,926
Current operating lease liabilities	37,660
Other current liabilities	15,430	19,320
Total current liabilities	304,902	235,418
Long-term liabilities
Line of credit	242,000	282,000
Deferred tax liabilities, net	10,061	10,371
Non-current Income Taxes Payable	30,754	30,754
Deferred rent		16,584
Non-current operating lease liabilities	114,350
Other long-term liabilities	121,301	126,532
Total long-term liabilities	518,466	466,241
Total liabilities	823,368	701,659
Stockholders' equity
Common stock - $0.01 par value; 150,000,000 shares authorized; 46,296,816 and 46,194,717 shares outstanding as of March 31, 2019 and December 31, 2018, respectively	463	462
Additional paid-in capital	353,639	353,932
Treasury stock at cost: 35,755,437 and 35,857,536 shares as of March 31, 2019 and December 31, 2018, respectively	(608,490)	(610,177)
Accumulated other comprehensive income (loss)	(119,878)	(124,596)
Retained earnings	729,930	725,551
Noncontrolling interest	9,610	7,677
Total stockholders' equity	365,274	352,849
Total liabilities and stockholders' equity	$ 1,188,642	$ 1,054,508