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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 36,745 $ 60,200
Restricted cash 20,000  
Short-term investments 21,923 10,292
Accounts receivable, net 542,272 503,999
Prepaid expenses 18,763 15,584
Other current assets 17,706 37,160
Total current assets 657,409 627,235
Restricted cash   20,000
Investments 69,699 80,682
Property and equipment, net 133,037 123,536
Goodwill 4,382,995 4,283,963
Intangible assets, net 588,312 639,928
Other assets 103,459 91,934
Total assets 5,934,911 5,867,278
Current liabilities:    
Accounts payable and accrued expenses 469,342 438,017
Current portion of long-term debt and capital lease obligations 253 1,401
Income taxes payable 30,598 92,007
Total current liabilities 500,193 531,425
Line of credit 739,500 1,110,500
Long-term debt and capital lease obligations, net 1,234,780 740,923
Long-term professional liabilities 209,060 212,274
Deferred income taxes 131,240 147,797
Other liabilities 32,254 57,905
Total liabilities 2,847,027 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; 87,820 and 93,721 shares issued and outstanding, respectively 878 937
Additional paid-in capital 992,647 1,017,328
Retained earnings 2,094,359 2,048,189
Total shareholders' equity 3,087,884 3,066,454
Total liabilities and shareholders' equity $ 5,934,911 $ 5,867,278