Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 418,643	$ 316,337
Accounts receivable, net of allowance for doubtful accounts and billing adjustments of $3.9 million and $4.1 million at 2012 and 2011, respectively	246,335	248,541
Deferred income tax assets	7,846	12,872
Prepaid expenses and other current assets	81,016	72,431
Total current assets	753,840	650,181
Goodwill	354,879	355,498
Property and equipment, net of accumulated depreciation and amortization of $359.1 million and $357.1 million at 2012 and 2011, respectively	259,160	266,608
Computer software, net of accumulated amortization of $594.1 million and $567.4 million at 2012 and 2011, respectively	205,862	215,244
Contract acquisition costs, net of accumulated amortization of $284.6 million and $295.9 million at 2012 and 2011, respectively	160,819	162,987
Equity investments, net	85,843	82,924
Other intangible assets, net of accumulated amortization of $46.8 million and $39.8 million at 2012 and 2011, respectively	75,702	81,250
Deferred income tax assets, net	5,102	4,069
Other assets	35,334	39,631
Total assets	1,936,541	1,858,392
Current liabilities:
Current portion of long-term debt	184,186	181,251
Accounts payable	28,470	26,095
Accrued salaries and employee benefits	14,216	33,004
Current portion of obligations under capital leases	12,991	14,363
Other current liabilities	132,235	125,863
Total current liabilities	372,098	380,576
Long-term debt, excluding current portion	37,627	39,104
Deferred income tax liabilities	31,494	32,889
Obligations under capital leases, excluding current portion	22,449	24,489
Other long-term liabilities	59,155	60,325
Total liabilities	522,823	537,383
Shareholders' equity:
Common stock - $0.10 par value. Authorized 600,000 shares; 202,477 and 201,860 issued at 2012 and 2011, respectively; 189,107 and 189,031 outstanding at 2012 and 2011, respectively	20,245	20,186
Additional paid-in capital	132,374	125,948
Accumulated other comprehensive loss, net	(6,841)	(445)
Treasury stock, at cost (shares of 12,585 and 12,829 at 2012 and 2011, respectively)	(218,760)	(225,034)
Retained earnings	1,465,933	1,380,634
Total shareholders' equity	1,392,951	1,301,289
Noncontrolling interests in consolidated subsidiaries	20,767	19,720
Total equity	1,413,718	1,321,009
Commitments and contingencies
Total liabilities and equity	$ 1,936,541	$ 1,858,392