Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 38,056	$ 60,200
Restricted cash	19,000
Short-term investments	9,902	10,292
Accounts receivable, net	527,997	503,999
Prepaid expenses	15,752	15,584
Other current assets	14,223	37,160
Total current assets	624,930	627,235
Restricted cash	1,000	20,000
Investments	90,186	80,682
Property and equipment, net	131,922	123,536
Goodwill	4,304,740	4,283,963
Intangible assets, net	614,226	639,928
Other assets	92,634	91,934
Total assets	5,859,638	5,867,278
Current liabilities:
Accounts payable and accrued expenses	358,255	438,017
Current portion of long-term debt and capital lease obligations	860	1,401
Income taxes payable	52,098	92,007
Total current liabilities	411,213	531,425
Line of credit	1,149,500	1,110,500
Long-term debt and capital lease obligations, net	741,612	740,923
Long-term professional liabilities	207,687	212,274
Deferred income taxes	126,505	147,797
Other liabilities	36,199	57,905
Total liabilities	2,672,716	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; 93,374 and 93,721 shares issued and outstanding, respectively	934	937
Additional paid-in capital	1,032,573	1,017,328
Retained earnings	2,153,415	2,048,189
Total shareholders' equity	3,186,922	3,066,454
Total liabilities and shareholders' equity	$ 5,859,638	$ 5,867,278