Consolidated Balance Sheets (USD $)	Dec. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 66,701,000	$ 61,008,000
Restricted cash and cash equivalents	11,563,000	50,587,000
Marketable securities	107,250,000	85,051,000
Restricted marketable securities	135,207,000	83,625,000
Accounts receivable, less allowance for doubtful accounts of $3,166 and $3,713, respectively	74,693,000	71,696,000
Inventories	6,660,000	7,419,000
Prepaid expenses and other assets	1,132,000	1,082,000
Notes receivable	5,840,000	1,260,000
Federal income tax receivable	5,933,000	6,470,000
Total current assets	414,979,000	368,198,000
Property and Equipment:
Property and equipment, at cost	675,455,000	659,523,000
Accumulated depreciation and amortization	(254,548,000)	(229,872,000)
Net property and equipment	420,907,000	429,651,000
Other Assets:
Deposits	143,000	397,000
Goodwill	17,600,000	20,320,000
Notes receivable	15,949,000	21,189,000
Deferred income taxes	10,564,000	10,167,000
Investments in limited liability companies	40,039,000	20,502,000
Total other assets	84,295,000	72,575,000
Total assets	920,181,000	870,424,000
Current Liabilities:
Trade accounts payable	10,555,000	9,834,000
Accrued payroll	37,243,000	54,063,000
Amounts due to third party payors	17,001,000	16,807,000
Accrued risk reserves	110,331,000	98,732,000
Deferred income taxes	24,474,000	14,526,000
Other current liabilities	20,411,000	20,335,000
Dividends payable	6,480,000	6,362,000
Total current liabilities	226,495,000	220,659,000
Long-Term Debt	10,000,000	10,000,000
Other Noncurrent Liabilities	13,890,000	16,244,000
Deferred Revenue	10,124,000	11,785,000
Stockholders’ Equity:
Series A Convertible Preferred Stock; $.01 par value; 25,000,000 shares authorized; 10,838,412 and 10,838,490 shares, respectively, issued and outstanding; stated at liquidation value of $15.75 per share	170,514,000	170,515,000
Common stock, $.01 par value; 30,000,000 shares authorized; 14,158,127 and 13,862,738 shares, respectively, issued and outstanding	141,000	138,000
Capital in excess of par value	154,692,000	139,183,000
Retained earnings	283,517,000	265,198,000
Accumulated other comprehensive income	50,808,000	36,702,000
Total stockholders’ equity	659,672,000	611,736,000
Total liabilities and stockholders’ equity	$ 920,181,000	$ 870,424,000