Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 29,988us-gaap_NetIncomeLoss	$ 28,787us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and depreciation	4,307	9,663
Asset impairment	1,884us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Share-based compensation expense	6,668us-gaap_ShareBasedCompensation	9,164us-gaap_ShareBasedCompensation
Deferred income taxes	(12,735)us-gaap_DeferredIncomeTaxExpenseBenefit	18,129us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefit on share-based compensation	(3,537)	(997)
Net realized (gain) loss on investments	(605)	(308)
Other changes	8,210us-gaap_OtherNoncashIncomeExpense	9,562us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Premiums receivable and unearned premiums	717,140	(16,588)
Other current assets, receivables and noncurrent assets	(187,633)	(147,387)
Amounts receivable/payable under government contracts	(48,831)	34,089
Reserves for claims and other settlements	17,743	167,883
Accounts payable and other liabilities	328,019	199,461
Net cash provided by operating activities	860,618	311,458
CASH FLOWS FROM INVESTING ACTIVITIES:
Sales of investments	93,476	66,499
Maturities of investments	29,061	24,469
Purchases of investments	(796,719)	(125,564)
Purchases of property and equipment	(9,221)	(17,437)
Sales (purchases) of restricted investments and other	(6,898)	3,537
Net cash used in investing activities	(690,301)	(48,496)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options and employee stock purchases	9,691	3,746
Excess tax benefit on share-based compensation	3,537	997
Repurchases of common stock	(111,680)	(11,292)
Borrowings under financing arrangements	130,000us-gaap_ProceedsFromLinesOfCredit	0us-gaap_ProceedsFromLinesOfCredit
Repayment of borrowings under financing arrangements	(35,000)us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit
Net increase (decrease) in checks outstanding, net of deposits	0	713
Customer funds administered	(17,645)us-gaap_IncreaseDecreaseInOtherDeposits	46,743us-gaap_IncreaseDecreaseInOtherDeposits
Net cash (used in) provided by financing activities	(21,097)	40,907
Net increase in cash and cash equivalents	149,220	303,869
Cash and cash equivalents, beginning of period	869,133	433,155
Cash and cash equivalents, end of period	1,018,353	737,024
SUPPLEMENTAL CASH FLOWS DISCLOSURE:
Interest paid	1,212us-gaap_InterestPaid	968us-gaap_InterestPaid
Income taxes paid	$ 3,936us-gaap_IncomeTaxesPaidNet	$ 338us-gaap_IncomeTaxesPaidNet

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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