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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 34,461 $ 60,200
Restricted cash 20,000  
Short-term investments 13,965 10,292
Accounts receivable, net 522,826 503,999
Prepaid expenses 17,841 15,584
Other current assets 16,308 37,160
Total current assets 625,401 627,235
Restricted cash   20,000
Investments 81,226 80,682
Property and equipment, net 137,832 123,536
Goodwill 4,303,427 4,283,963
Intangible assets, net 595,415 639,928
Other assets 95,423 91,934
Total assets 5,838,724 5,867,278
Current liabilities:    
Accounts payable and accrued expenses 413,739 438,017
Current portion of long-term debt and capital lease obligations 535 1,401
Income taxes payable 21,667 92,007
Total current liabilities 435,941 531,425
Line of credit 1,264,000 1,110,500
Long-term debt and capital lease obligations, net 741,958 740,923
Long-term professional liabilities 210,942 212,274
Deferred income taxes 129,637 147,797
Other liabilities 40,941 57,905
Total liabilities 2,823,419 2,800,824
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; 89,349 and 93,721 shares issued and outstanding, respectively 893 937
Additional paid-in capital 998,670 1,017,328
Retained earnings 2,015,742 2,048,189
Total shareholders' equity 3,015,305 3,066,454
Total liabilities and shareholders' equity $ 5,838,724 $ 5,867,278