Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 77,910	$ 55,264
Accounts receivable, net	288,041	300,808
Prepaids and other current assets	67,080	59,905
Income tax receivable	7,703	7,035
Total assets held for sale	8,969	10,715
Total current assets	449,703	433,727
Long-term assets
Property, plant and equipment, net	160,321	151,037
Goodwill	166,874	129,648
Deferred tax assets, net	32,988	53,585
Other intangible assets, net	60,742	30,787
Other long-term assets	59,495	47,520
Total long-term assets	480,420	412,577
Total assets	930,123	846,304
Current liabilities
Accounts payable	36,022	38,197
Accrued employee compensation and benefits	81,544	66,133
Other accrued expenses	23,911	14,830
Income taxes payable	9,822	7,040
Deferred revenue	22,964	23,318
Other current liabilities	23,089	29,154
Total liabilities held for sale	1,908	1,357
Total current liabilities	199,260	180,029
Long-term liabilities
Line of credit	257,000	217,300
Deferred tax liabilities, net	137	160
Deferred rent	15,800	15,256
Other long-term liabilities	62,668	71,664
Total long-term liabilities	335,605	304,380
Total liabilities	534,865	484,409
Commitments and contingencies (Note 10)
Stockholders' equity
Common stock - $0.01 par value; 150,000,000 shares authorized; 45,694,081 and 46,113,693 shares outstanding as of June 30, 2017 and December 31, 2016, respectively	458	462
Additional paid-in capital	351,006	348,739
Treasury stock at cost: 36,358,172 and 35,938,560 shares as of June 30, 2017 and December 31, 2016, respectively	(618,452)	(603,262)
Accumulated other comprehensive income (loss)	(104,707)	(126,964)
Retained earnings	759,809	735,939
Noncontrolling interest	7,144	6,981
Total stockholders' equity	395,258	361,895
Total liabilities and stockholders' equity	$ 930,123	$ 846,304