Interim Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 59,714	$ 61,008
Restricted cash and cash equivalents	53,186	50,587
Marketable securities	93,074	85,051
Restricted marketable securities	85,207	83,625
Accounts receivable, less allowance for doubtful accounts of $3,735 and $3,713, respectively	70,360	69,635
Inventories	6,938	7,419
Prepaid expenses and other assets	2,779	1,082
Federal income tax receivable		3,779
Total current assets	371,258	362,186
Property and Equipment:
Property and equipment, at cost	661,702	659,523
Accumulated depreciation and amortization	(236,987)	(229,872)
Net property and equipment	424,715	429,651
Other Assets:
Deposits	455	397
Goodwill	17,600	20,320
Notes receivable	22,279	22,449
Deferred income taxes	10,374	10,167
Investments in limited liability companies	27,601	20,502
Total other assets	78,309	73,835
Total assets	874,282	865,672
Current Liabilities:
Trade accounts payable	10,108	9,834
Accrued payroll	37,418	54,063
Amounts due to third party payors	16,991	16,807
Accrued risk reserves	99,695	98,732
Deferred income taxes	17,238	14,526
Other current liabilities	16,990	15,583
Dividends payable	6,411	6,362
Total current liabilities	204,851	215,907
Long-Term Debt, less Current Portion	10,000	10,000
Other Noncurrent Liabilities	16,104	16,244
Deferred Revenue	14,295	11,785
Stockholders’ Equity:
Series A Convertible Preferred Stock; $.01 par value; 25,000,000 shares authorized;10,838,490 shares issued and outstanding; stated at liquidation of $15.75 per share	170,515	170,515
Common stock, $.01 par value; 30,000,000 shares authorized; 13,982,788 and 13,862,738 shares, respectively, issued and outstanding	139	138
Capital in excess of par value	145,306	139,183
Retained earnings	271,511	265,198
Accumulated other comprehensive income	41,561	36,702
Total stockholders’ equity	629,032	611,736
Total liabilities and stockholders’ equity	$ 874,282	$ 865,672