CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities
Net income	$ 15,644	$ 17,611
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	3,830	3,836
Provision for bad debts	7,125	5,408
Stock-based compensation expense	1,895	2,387
Deferred income taxes	1,270	1,803
(Gain) loss on sale of assets	15	113
Changes in operating assets and liabilities, net of acquisitions:
Receivables	(10,837)	(4,875)
Prepaid expenses and other assets	(1,519)	2,090
Prepaid income taxes	3,479	10,802
Accounts payable and accrued expenses	7,600	416
Net amounts due to/from governmental entities	(432)	132
Net cash provided by operating activities	28,070	39,723
Investing activities
Purchases of property, building and equipment	(3,569)	(3,314)
Proceeds from sale of assets		23
Cash paid for acquisitions, primarily goodwill and intangible assets and advanced payment on acquisitions	(26,920)	(1,700)
Net cash (used in) investing activities	(30,489)	(4,991)
Financing activities
Proceeds from line of credit	55,000	66,446
Payments on line of credit	(49,500)	(92,957)
Proceeds from employee stock purchase plan	392	407
Proceeds from debt issuance	567
Noncontrolling interest distributions	(4,352)	(4,452)
Excess tax benefits from vesting of restricted stock	11
Redemption of treasury shares	(755)
Purchase of additional controlling interest	(1,618)	(126)
Payments on repurchase of common stock		(4,001)
Sale of noncontrolling interest		80
Net cash (used in) financing activities	(255)	(34,603)
Change in cash	(2,674)	129
Cash at beginning of period	9,720	256
Cash at end of period	7,046	385
Supplemental disclosures of cash flow information
Interest paid	1,125	567
Income taxes paid	$ 14,376	$ 8,203