Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 74,437	$ 55,264
Accounts receivable, net	385,751	300,808
Prepaids and other current assets	63,668	59,905
Income tax receivable	11,099	7,035
Total assets held for sale	7,835	10,715
Total current assets	542,790	433,727
Long-term assets
Property, plant and equipment, net	163,297	151,037
Goodwill	206,694	129,648
Deferred tax assets, net	12,012	53,585
Other intangible assets, net	92,086	30,787
Other long-term assets	61,857	47,520
Total long-term assets	535,946	412,577
Total assets	1,078,736	846,304
Current liabilities
Accounts payable	46,029	38,197
Accrued employee compensation and benefits	83,997	66,133
Other accrued expenses	18,993	14,830
Income taxes payable	7,497	7,040
Deferred revenue	21,628	23,318
Other current liabilities	22,312	29,154
Total liabilities held for sale	1,322	1,357
Total current liabilities	201,778	180,029
Long-term liabilities
Line of credit	344,000	217,300
Deferred tax liabilities, net	11,285	160
Non-current Income Taxes Payable	47,871
Deferred rent	15,714	15,256
Other long-term liabilities	95,243	71,664
Total long-term liabilities	514,113	304,380
Total liabilities	715,891	484,409
Stockholders' equity
Common stock - $0.01 par value; 150,000,000 shares authorized; 45,861,959 and 46,113,693 shares outstanding as of December 31, 2017 and December 31, 2016, respectively	459	462
Additional paid-in capital	351,725	348,739
Treasury stock at cost: 36,190,294 and 35,938,560 shares as of December 31, 2017 and December 31, 2016, respectively	(615,677)	(603,262)
Accumulated other comprehensive income (loss)	(102,304)	(126,964)
Retained earnings	721,664	735,939
Noncontrolling interest	6,978	6,981
Total stockholders' equity	362,845	361,895
Total liabilities and stockholders' equity	$ 1,078,736	$ 846,304