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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 21,280 $ 18,596
Short-term investments 6,584 4,139
Accounts receivable, net 248,066 230,388
Prepaid expenses 4,852 6,305
Deferred income taxes 69,034 70,314
Other assets 9,228 7,531
Total current assets 359,044 337,273
Investments 47,593 44,991
Property and equipment, net 59,738 60,530
Goodwill 2,165,672 1,746,762
Other assets, net 118,290 83,092
Total assets 2,750,337 2,272,648
Current liabilities:    
Accounts payable and accrued expenses 255,661 234,535
Current portion of long-term capital lease obligations 101 143
Income taxes payable 12,576 19,623
Total current liabilities 268,338 254,301
Line of credit 144,000 29,000
Long-term capital lease obligations 233 327
Long-term professional liabilities 119,570 109,629
Deferred income taxes 125,877 93,831
Other liabilities 56,951 54,544
Total liabilities 714,969 541,632
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; 50,019 and 48,933 shares issued and outstanding, respectively 500 489
Additional paid-in capital 788,080 724,646
Retained earnings 1,246,788 1,005,881
Total shareholders' equity 2,035,368 1,731,016
Total liabilities and shareholders' equity $ 2,750,337 $ 2,272,648