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	$ 3,846	$ 2,019
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,312	1,454
Provision for loss on doubtful accounts	243	155
Loss (gain) on sale of investments, net	8	(10)
Gain on sale of property and equipment	(78)	(163)
Stock-based compensation	504	375
Insurance reserves	(93)	(205)
Changes in operating assets and liabilities:
Patient accounts receivable	(1,097)	(290)
Other accounts receivable	(975)	(370)
Prepaid expenses and other	449	1,406
Accounts payable	1,431	535
Deferred revenue, net of professional fees	(738)	(1,142)
Accrued liabilities and other	(319)	1,051
Net cash provided by operations	4,493	4,815
Cash flows from investing activities:
Purchases of property and equipment	(67)	(634)
Proceeds from sale of assets	127	570
Purchases of investment securities	(32,203)	(40,061)
Proceeds from sale of investment securities	32,929	42,267
Other, net		8
Net cash provided by investing activities	786	2,150
Cash flows from financing activities:
Principal payments of loan	(731)	(979)
Shares repurchased for treasury stock	(357)	(288)
Proceeds from exercise of stock options	52	23
Net cash used in financing activities	(1,036)	(1,244)
Net effect of exchange rate changes on cash and cash equivalents	103	131
Increase in cash and cash equivalents	4,346	5,852
Cash and cash equivalents at beginning of period	18,568	19,350
Cash and cash equivalents at end of period	$ 22,914	$ 25,202