Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 139,268	$ 178,946
Accounts receivable, net	223,443	206,772
Prepaid expenses and other current assets	30,925	20,210
Income tax receivable	3,210	18,817
Deferred financing costs, net	564	564
Total current assets	397,410	425,309
Property and equipment, net	86,947	94,435
Goodwill	599,351	487,617
Intangible assets, net	131,849	67,140
Operating lease right-of-use assets	17,493
Deferred financing costs, net	1,109	1,673
Other assets	10,117	2,344
Total assets	1,244,276	1,078,518
Current liabilities:
Accounts payable, accrued expenses and other liabilities	97,747	74,902
Liability for appeals	3,570	21,723
Total current liabilities	101,317	96,625
Long-term liabilities:
Revolving credit facility	240,000	240,000
Operating lease liabilities	14,881	0
Net deferred tax liabilities	25,587	18,485
Other liabilities	7,626	10,012
Total long-term liabilities	288,094	268,497
Total liabilities	389,411	365,122
Commitments and contingencies
Equity [Abstract]
Preferred stock -- $0.01 par value; 5,000,000 shares authorized; none issued	0	0
Common stock -- $0.01 par value; 175,000,000 shares authorized; 101,766,468 shares issued and 88,103,566 shares outstanding at December 31,2019; 98,924,501 shares issued and 85,261,664 shares outstanding at December 31, 2018	1,018	989
Capital in excess of par value	479,964	425,748
Retained earnings	509,459	422,235
Treasury stock, at cost: 13,663,194 shares at December 31, 2019 and 13,663,194 shares at December 31, 2018	(135,576)	(135,576)
Total shareholders' equity	854,865	713,396
Total liabilities and shareholders' equity	$ 1,244,276	$ 1,078,518