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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 13,163 $ 21,280
Short-term investments 7,009 6,584
Accounts receivable, net 269,774 248,066
Prepaid expenses 7,055 4,852
Deferred income taxes 60,914 69,034
Other assets 9,776 9,228
Total current assets 367,691 359,044
Investments 59,851 47,593
Property and equipment, net 61,408 59,738
Goodwill 2,273,288 2,165,672
Other assets, net 127,152 118,290
Total assets 2,889,390 2,750,337
Current liabilities:    
Accounts payable and accrued expenses 204,154 255,661
Current portion of long-term capital lease obligations 97 101
Income taxes payable 8,522 12,576
Total current liabilities 212,773 268,338
Line of credit 153,800 144,000
Long-term capital lease obligations 184 233
Long-term professional liabilities 131,532 119,570
Deferred income taxes 140,612 125,877
Other liabilities 57,344 56,951
Total liabilities 696,245 714,969
Commitments and contingencies      
Shareholders' equity:    
Preferred stock; $.01 par value; 1,000 shares authorized; none issued      
Common stock; $.01 par value; 100,000 shares authorized; 50,586 and 50,019 shares issued and outstanding, respectively 506 500
Additional paid-in capital 821,266 788,080
Retained earnings 1,371,373 1,246,788
Total shareholders' equity 2,193,145 2,035,368
Total liabilities and shareholders' equity $ 2,889,390 $ 2,750,337