Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 996,854	$ 869,133
Investments-available-for-sale (amortized cost: 2015-$2,209,670, 2014-$1,777,404)	2,218,367	1,791,060
Premiums receivable, net of allowance for doubtful accounts (2015-$3,732, 2014-$1,671)	943,746	951,935
Amounts receivable under government contracts	267,655	150,546
Other receivables	467,526	424,910
Deferred taxes	91,005	57,911
Assets held for sale	0	50,000
Other assets	338,890	220,122
Total current assets	5,324,043	4,515,617
Property and equipment, net	146,053	84,328
Goodwill	558,886	558,886
Other intangible assets, net	9,060	11,822
Deferred taxes	12,230	33,081
Investments-available-for-sale-noncurrent (amortized cost: 2015-$34,197, 2014-$5,474)	27,580	4,570
Other noncurrent assets	319,794	187,630
Total Assets	6,397,646	5,395,934
Current Liabilities:
Reserves for claims and other settlements	1,493,392	1,896,035
Health care and other costs payable under government contracts	85,132	71,988
Unearned premiums	134,232	96,106
Line of Credit, Current	285,000	0
Accounts payable and other liabilities	1,874,154	880,374
Total current liabilities	3,871,910	2,944,503
Senior notes payable	399,709	399,504
Borrowings under revolving credit facility	0	100,000
Other noncurrent liabilities	292,947	242,705
Total Liabilities	$ 4,564,566	$ 3,686,712
Commitments and contingencies
Stockholders’ Equity:
Preferred stock ($0.001 par value, 10,000 shares authorized, none issued and outstanding)	$ 0	$ 0
Common stock ($0.001 par value, 350,000 shares authorized; issued 2015-153,776 shares; 2014-152,451 shares)	154	153
Additional paid-in capital	1,497,562	1,444,705
Treasury common stock, at cost (2015-76,458 shares of common stock; 2014-74,378 shares of common stock)	(2,454,939)	(2,341,652)
Retained earnings	2,794,954	2,609,277
Accumulated other comprehensive income	(4,651)	(3,261)
Total Stockholders’ Equity	1,833,080	1,709,222
Total Liabilities and Stockholders’ Equity	$ 6,397,646	$ 5,395,934