Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 27,121	$ 16,124
Reconciling items:
Depreciation and amortization	2,279	1,938
Amortization of intangible assets	1,340	1,273
Share-based compensation expense	(184)	788
Equity in losses of affiliate	324
Bad debt expense	649	1,280
Deferred income taxes		224
Loss on sale or disposal of fixed assets	394
Changes in operating assets and liabilities:
Accounts receivable	(10,956)	(793)
Prepaid expenses and other current assets	(377)	687
Other assets	684	(172)
Accounts payable and accrued expenses	2,930	(4,971)
Other current and non-current liabilities	3,568	221
Net cash flows provided by operating activities	27,772	16,599
Cash flows from investing activities:
Additions to premises and equipment	(16,154)	(1,355)
Investment in equity affiliate		(1,113)
Change in restricted cash		(177)
Net cash flows used in investing activities	(16,154)	(2,645)
Cash flows from financing activities:
Principal payments on capital lease obligations	(201)	(149)
Proceeds from stock option exercises	1,977	441
Purchase of treasury stock	(16,781)	(7,238)
Contributions from non-controlling interests	11	6
Distributions to non-controlling interests	(2,083)	(2,824)
Net cash flows used in financing activities	(17,077)	(9,764)
Net (decrease) increase in cash and cash equivalents	(5,459)	4,190
Cash and cash equivalents at the beginning of the period	32,125	22,134
Cash and cash equivalents at the end of the period	26,666	26,324
Supplemental cash flow information
Interest paid	15	21
Income taxes paid, net	694	563
Non-cash investing and financing activities
Tax amortizable goodwill	$ 842	$ 863