CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 133,546	$ 133,116
Accounts receivable, net of allowance for doubtful accounts of $1,478 and $1,898, respectively, and estimated allowance for appeals of $5,473 and $4,824 at March 31, 2015 and December 31, 2014, respectively	166,445	157,101
Prepaid expenses	12,793	11,810
Prepaid income taxes	4,541	5,142
Deferred tax assets	5,021	7,811
Other current assets	2,588	2,639
Total current assets	324,934	317,619
Property and equipment, net	110,438	116,027
Goodwill	361,468	361,468
Intangible assets, net	69,501	74,578
Deferred financing costs, net	6,436	6,957
Other assets	4,486	4,339
Total assets	877,263	880,988
Current liabilities:
Accounts payable, accrued expenses and other liabilities	42,200	54,549
Estimated liability for appeals	36,986	36,799
Total current liabilities	79,186	91,348
Long-term liabilities:
Revolving credit facility	197,796	197,796
Deferred tax liabilities	48,227	50,853
Deferred rent	5,648	5,037
Other liabilities	2,814	2,864
Total long-term liabilities	254,485	256,550
Total liabilities	333,671	347,898
Commitments and contingencies (Note 8)
Stockholders' 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; 95,031,690 shares issued and 88,505,385 shares outstanding at March 31, 2015; 94,511,444 shares issued and 87,985,139 shares outstanding at December 31, 2014	948	943
Capital in excess of par value	320,189	313,214
Retained earnings	267,469	263,947
Treasury stock, at cost: 6,526,305 shares at March 31, 2015 and at December 31, 2014	(45,014)	(45,014)
Total stockholders' equity	543,592	533,090
Total liabilities and stockholders' equity	$ 877,263	$ 880,988