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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 60,200 $ 55,698
Short-term investments 10,292 11,286
Accounts receivable, net 503,999 495,276
Prepaid expenses 15,584 11,051
Other assets 37,160 13,817
Total current assets 627,235 587,128
Restricted cash 20,000  
Investments 80,682 78,975
Property and equipment, net 123,536 103,068
Goodwill 4,283,963 3,845,157
Intangible assets, net 639,928 668,529
Other assets 91,934 56,543
Total assets 5,867,278 5,339,400
Current liabilities:    
Accounts payable and accrued expenses 438,017 407,938
Current portion of long-term debt and capital lease obligations 1,401 22,054
Income taxes payable 92,007 18,957
Total current liabilities 531,425 448,949
Line of credit 1,110,500 783,500
Long-term debt and capital lease obligations, net 740,923 900,128
Long-term professional liabilities 212,274 173,080
Deferred income taxes 147,797 227,802
Other liabilities 57,905 45,174
Total liabilities 2,800,824 2,578,633
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; 93,721 and 93,718 shares issued and outstanding, respectively 937 937
Additional paid-in capital 1,017,328 974,304
Retained earnings 2,048,189 1,785,526
Total shareholders' equity 3,066,454 2,760,767
Total liabilities and shareholders' equity $ 5,867,278 $ 5,339,400