Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities
Net income	$ 17,611	$ 22,904
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	3,836	3,939
Provision for bad debts	5,408	5,704
Stock-based compensation expense	2,387	1,960
Deferred income taxes	1,803	3,375
Loss on sale of assets	113
Changes in operating assets and liabilities, net of acquisitions:
Receivables	(4,875)	(4,254)
Prepaid expenses and other assets	2,090	5,984
Prepaid income taxes	10,802	(3,899)
Accounts payable and accrued expenses	416	(1,950)
Net amounts due to/from governmental entities	132
Net cash provided by operating activities	39,723	33,763
Investing activities
Purchases of property, building and equipment	(3,314)	(5,761)
Proceeds from sale of assets	23
Cash paid for acquisitions, primarily goodwill, intangible assets and advance payments on acquisition	(1,700)	(11,770)
Net cash used in investing activities	(4,991)	(17,531)
Financing activities
Proceeds from line of credit	66,446	49,187
Payments on line of credit	(92,957)	(49,187)
Payments on capital leases		(14)
Excess tax benefits from vesting of restricted stock		318
Proceeds from employee stock purchase plan	407	426
Noncontrolling interest distributions	(4,452)	(6,645)
Payments on repurchase of common stock	(4,001)	(577)
Purchase of additional controlling interest	(126)	(816)
Sale of noncontrolling interest	80
Net cash used in financing activities	(34,603)	(7,308)
Change in cash	129	8,924
Cash at beginning of period	256	288
Cash at end of period	385	9,212
Supplemental disclosures of cash flow information
Interest paid	567	290
Income taxes paid	$ 8,203	$ 11,956