CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net income	$ 11,915	$ 9,883
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	3,190	2,948
Provision for bad debts	2,369	4,601
Stock-based compensation expense	1,581	982
Deferred income taxes	475	(124)
Loss on disposal of assets	152	204
Changes in operating assets and liabilities, net of acquisitions:
Receivables	(341)	(12,446)
Prepaid expenses and other assets	(2,413)	(162)
Prepaid income taxes		374
Accounts payable and accrued expenses	18,524	13,110
Income taxes payable	164
Net amounts due to/from governmental entities	(985)	(2,209)
Net cash provided by operating activities	34,631	17,161
Investing activities:
Purchases of property, building and equipment	(2,523)	(2,622)
Cash paid for acquisitions, primarily goodwill and intangible assets	(449)	(10,577)
Advanced payments on acquisitions	(4,487)
Other		273
Net cash used in investing activities	(7,459)	(12,926)
Financing activities:
Proceeds from line of credit	5,000	4,000
Payments on line of credit	(14,000)	(6,000)
Proceeds from employee stock purchase plan	256	230
Payments on debt	(65)	(56)
Noncontrolling interest distributions	(2,391)	(2,185)
Sale of noncontrolling interest	114
Excess tax benefits from vesting of stock awards		651
Withholding taxes paid on stock-based compensation	(2,569)	(1,421)
Net cash used in financing activities	(13,655)	(4,781)
Change in cash	13,517	(546)
Cash at beginning of period	3,264	6,139
Cash at end of period	16,781	5,593
Supplemental disclosures of cash flow information:
Interest paid	721	749
Income taxes paid	$ 4,580	$ 4,466