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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 19,775 $ 31,137
Short-term investments 7,725 6,457
Accounts receivable, net 315,689 285,397
Prepaid expenses 4,576 6,361
Deferred income taxes 36,959 30,766
Other assets 11,272 8,007
Total current assets 395,996 368,125
Investments 56,512 57,511
Property and equipment, net 60,700 59,911
Goodwill 2,457,574 2,393,731
Other assets, net 128,362 129,438
Total assets 3,099,144 3,008,716
Current liabilities:    
Accounts payable and accrued expenses 178,088 308,754
Current portion of long-term capital lease obligations 102 92
Income taxes payable 44,005 17,946
Total current liabilities 222,195 326,792
Line of credit 248,000 27,000
Long-term capital lease obligations 108 143
Long-term professional liabilities 145,786 139,367
Deferred income taxes 117,543 111,441
Other liabilities 58,432 60,985
Total liabilities 792,064 665,728
Commitments and contingencies      
Shareholders' equity:    
Preferred stock; $.01 par value; 1,000 shares authorized; none issued      
Common stock; $.01 par value; 200,000 shares authorized; 99,465 and 101,207 shares issued and outstanding, respectively 995 1,012
Additional paid-in capital 858,456 857,953
Retained earnings 1,447,629 1,484,023
Total shareholders' equity 2,307,080 2,342,988
Total liabilities and shareholders' equity $ 3,099,144 $ 3,008,716