CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 150,429	$ 133,116
Accounts receivable, net of allowance for doubtful accounts of $1,478 and $1,898, respectively, and estimated allowance for appeals of $5,943 and $4,824 at June 30, 2015 and December 31, 2014, respectively	167,262	157,101
Prepaid expenses	11,182	11,810
Prepaid income taxes	333	5,142
Deferred tax assets	3,993	7,811
Other current assets	2,634	2,639
Total current assets	335,833	317,619
Property and equipment, net	104,921	116,027
Goodwill	361,468	361,468
Intangible assets, net	64,424	74,578
Deferred financing costs, net	5,915	6,957
Other assets	4,999	4,339
Total assets	877,560	880,988
Current liabilities:
Accounts payable, accrued expenses and other liabilities	40,132	54,549
Estimated liability for appeals	34,014	36,799
Total current liabilities	74,146	91,348
Long-term liabilities:
Revolving credit facility	197,796	197,796
Deferred tax liabilities	44,755	50,853
Deferred rent	5,896	5,037
Other liabilities	2,832	2,864
Total long-term liabilities	251,279	256,550
Total liabilities	$ 325,425	$ 347,898
Commitments and contingencies (Note 8)
Shareholders' equity:
Preferred stock-$0.01 par value; 5,000,000 shares authorized; none issued
Common stock - $0.01 par value; 125,000,000 shares authorized; 95,078,772 shares issued and 88,552,467 shares outstanding at June 30, 2015; 94,511,444 shares issued and 87,985,139 shares outstanding at December 31, 2014	$ 950	$ 943
Capital in excess of par value	323,312	313,214
Retained earnings	272,887	263,947
Treasury stock, at cost: 6,526,305 shares at June 30, 2015 and at December 31, 2014	(45,014)	(45,014)
Total shareholders' equity	552,135	533,090
Total liabilities and shareholders' equity	$ 877,560	$ 880,988