Condensed Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 263,334	$ 394,795
Restricted cash	18	434
Accounts receivable, net of allowance for doubtful accounts and billing adjustments of $4.9 million and $4.5 million at 2011 and 2010, respectively	226,327	238,283
Deferred income tax assets	12,090	11,090
Prepaid expenses and other current assets	85,892	77,211
Total current assets	587,661	721,813
Property and equipment, net of accumulated depreciation and amortization of $342.4 million and $317.4 million at 2011 and 2010, respectively	293,637	300,102
Computer software, net of accumulated amortization of $535.2 million and $497.6 million at 2011 and 2010, respectively	228,521	246,424
Contract acquisition costs, net of accumulated amortization of $280.5 million and $260.7 million at 2011 and 2010, respectively	167,450	166,251
Goodwill	357,151	320,399
Equity investments	81,951	77,127
Other intangible assets, net of accumulated amortization of $33.4 million and $26.9 million at 2011 and 2010, respectively	85,596	83,118
Other assets	30,311	37,027
Total assets	1,832,278	1,952,261
Current liabilities:
Current portion of long-term debt	38,813	39,557
Current portion of obligations under capital leases	13,293	13,191
Accrued salaries and employee benefits	19,457	27,414
Accounts payable	29,189	36,068
Other current liabilities	128,452	111,040
Total current liabilities	229,204	227,270
Long-term debt, excluding current portion	188,102	194,703
Deferred income tax liabilities	189	42,547
Obligations under capital leases, excluding current portion	25,913	30,573
Other long-term liabilities	60,212	53,363
Total liabilities	503,620	548,456
Redeemable noncontrolling interest in consolidated subsidiary Equity		146,000
Shareholders' equity:
Common stock - $0.10 par value. Authorized 600,000 shares; 201,602 and 201,326 issued at 2011 and 2010, respectively; 192,908 and 194,528 outstanding at 2011 and 2010, respectively	20,140	20,133
Additional paid-in capital	136,072	119,722
Accumulated other comprehensive income (loss), net	8,334	(2,585)
Treasury stock, at cost (shares of 8,694 and 6,798 at 2011 and 2010, respectively)	(149,194)	(115,449)
Retained earnings	1,294,877	1,219,303
Total shareholders' equity	1,310,229	1,241,124
Noncontrolling interests in consolidated subsidiaries	18,429	16,681
Total equity	1,328,658	1,257,805
Total liabilities and equity	$ 1,832,278	$ 1,952,261