CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net income	$ 53,339	$ 28,634
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	8,400	7,548
Amortization of operating lease right of use asset	15,528	0
Stock-based compensation expense	4,392	3,919
Deferred income taxes	4,821	1,714
Loss (gain) on disposal of assets	312	(126)
Impairment of intangibles and other	7,337	778
Changes in operating assets and liabilities, net of acquisitions:
Receivables	(22,704)	(18,897)
Prepaid expenses and other assets	(324)	(6,521)
Prepaid income taxes	5,063	4,624
Accounts payable and accrued expenses	(18,735)	8,729
Income taxes payable	374
Net amounts due to/from governmental entities	528	(704)
Net cash provided by operating activities	58,331	29,698
Investing activities:
Purchases of property, building and equipment	(7,599)	(13,760)
Cash acquired from business combination, net of cash paid	(20,431)	13,086
Net cash used in investing activities	(28,030)	(674)
Financing activities:
Proceeds from line of credit	25,000	270,084
Payments on line of credit	(30,000)	(278,884)
Proceeds from employee stock purchase plan	931	634
Payments on debt	(7,650)	135
Payments on deferred financing fees	0	(1,881)
Noncontrolling interest distributions	(13,857)	(5,763)
Withholding taxes paid on stock-based compensation	(8,519)	(4,095)
Purchase of additional controlling interest	(18,748)	(55)
Exercise of options	(84)
Sale of noncontrolling interest	0	3,322
Net cash (used in) financing activities	(52,927)	(16,503)
Change in cash	(22,626)	12,521
Cash at beginning of period	49,363	2,849
Cash at end of period	26,737	15,370
Supplemental disclosures of cash flow information:
Interest paid	4,038	3,112
Income taxes paid	4,042	$ 2,139
Right-of-use assets obtained in exchange for new operating lease liabilities	98,070
Capital expenditures accrued	$ 1,000