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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 40,423 $ 55,698
Short-term investments 11,161 11,286
Accounts receivable, net 480,402 495,276
Prepaid expenses 12,315 11,051
Other current assets 13,269 13,817
Total current assets 557,570 587,128
Investments 86,286 78,975
Property and equipment, net 110,476 103,068
Goodwill 3,948,339 3,845,157
Intangible assets, net 643,002 668,529
Other assets 61,723 56,543
Total assets 5,407,396 5,339,400
Current liabilities:    
Accounts payable and accrued expenses 320,051 407,938
Current portion of long-term debt and capital lease obligations 27,040 22,054
Income taxes payable 3,057 18,957
Total current liabilities 350,148 448,949
Line of credit 860,500 783,500
Long-term debt and capital lease obligations, net 885,631 900,128
Long-term professional liabilities 176,416 173,080
Deferred income taxes 250,713 227,802
Other liabilities 45,740 45,174
Total liabilities 2,569,148 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; 93,480 and 93,718 shares issued and outstanding, respectively 935 937
Additional paid-in capital 991,106 974,304
Retained earnings 1,846,207 1,785,526
Total shareholders' equity 2,838,248 2,760,767
Total liabilities and shareholders' equity $ 5,407,396 $ 5,339,400