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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 31,137 $ 21,280
Short-term investments 6,457 6,584
Accounts receivable, net 285,397 248,066
Prepaid expenses 6,361 4,852
Deferred income taxes 71,480 69,034
Other assets 8,007 9,228
Total current assets 408,839 359,044
Investments 57,511 47,593
Property and equipment, net 59,911 59,738
Goodwill 2,393,731 2,165,672
Other assets, net 129,438 118,290
Total assets 3,049,430 2,750,337
Current liabilities:    
Accounts payable and accrued expenses 308,754 255,661
Current portion of long-term capital lease obligations 92 101
Income taxes payable 17,946 12,576
Total current liabilities 326,792 268,338
Line of credit 27,000 144,000
Long-term capital lease obligations 143 233
Long-term professional liabilities 139,367 119,570
Deferred income taxes 152,155 125,877
Other liabilities 60,985 56,951
Total liabilities 706,442 714,969
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; 101,207 and 100,038 shares issued and outstanding, respectively 1,012 1,000
Additional paid-in capital 857,953 787,580
Retained earnings 1,484,023 1,246,788
Total shareholders' equity 2,342,988 2,035,368
Total liabilities and shareholders' equity $ 3,049,430 $ 2,750,337