Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 78,842	$ 55,264
Accounts receivable, net	304,493	300,808
Prepaids and other current assets	67,516	59,905
Income tax receivable	8,078	7,035
Total assets held for sale	9,279	10,715
Total current assets	468,208	433,727
Long-term assets
Property, plant and equipment, net	162,361	151,037
Goodwill	166,584	129,648
Deferred tax assets, net	30,953	53,585
Other intangible assets, net	61,784	30,787
Other long-term assets	59,628	47,520
Total long-term assets	481,310	412,577
Total assets	949,518	846,304
Current liabilities
Accounts payable	45,155	38,197
Accrued employee compensation and benefits	85,820	66,133
Other accrued expenses	29,405	14,830
Income taxes payable	10,194	7,040
Deferred revenue	23,416	23,318
Other current liabilities	23,497	29,154
Total liabilities held for sale	2,491	1,357
Total current liabilities	219,978	180,029
Long-term liabilities
Line of credit	255,000	217,300
Deferred tax liabilities, net	155	160
Deferred rent	16,023	15,256
Other long-term liabilities	58,568	71,664
Total long-term liabilities	329,746	304,380
Total liabilities	549,724	484,409
Commitments and contingencies (Note 10)
Stockholders' equity
Common stock - $0.01 par value; 150,000,000 shares authorized; 45,847,389 and 46,113,693 shares outstanding as of September 30, 2017 and December 31, 2016, respectively	458	462
Additional paid-in capital	348,932	348,739
Treasury stock at cost: 36,204,864 and 35,938,560 shares as of September 30, 2017 and December 31, 2016, respectively	(615,917)	(603,262)
Accumulated other comprehensive income (loss)	(103,893)	(126,964)
Retained earnings	763,116	735,939
Noncontrolling interest	7,098	6,981
Total stockholders' equity	399,794	361,895
Total liabilities and stockholders' equity	$ 949,518	$ 846,304