CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 131,466	$ 135,227
Accounts receivable, net of allowance for doubtful accounts of $1,006 and $830 and estimated allowance for appeals of $10,949 and $6,985 at June 30, 2013 and December 31, 2012, respectively	163,786	153,014
Prepaid expenses	12,405	14,283
Prepaid income taxes	6,986
Current portion of deferred financing costs		3,336
Other current assets	390	317
Total current assets	315,033	306,177
Property and equipment, net	128,058	129,327
Goodwill	361,468	361,468
Intangible assets, net	106,416	119,119
Deferred financing costs	9,799	5,867
Other assets	4,481	3,988
Total assets	925,255	925,946
Current liabilities:
Accounts payable, accrued expenses and other liabilities	34,917	40,867
Acquisition related contingent consideration	432	425
Current portion of term loan		35,000
Deferred tax liabilities	2,289	2,398
Estimated liability for appeals	25,341	21,787
Total current liabilities	62,979	100,477
Long-term liabilities:
Deferred rent	592	500
Acquisition related contingent consideration	498	485
Revolving debt	302,796
Term loan		297,500
Other liabilities	4,560	3,305
Deferred tax liabilities	58,383	60,805
Total long-term liabilities	366,829	362,595
Total liabilities	429,808	463,072
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; 93,185,831 shares issued and 87,760,984 shares outstanding at June 30, 2013; 92,374,539 shares issued and 86,949,692 shares outstanding at December 31, 2012	930	923
Capital in excess of par value	287,132	271,962
Retained earnings	227,399	210,003
Treasury stock, at cost: 5,424,847 shares at June 30, 2013 and at December 31, 2012	(20,014)	(20,014)
Total shareholders' equity	495,447	462,874
Total liabilities and shareholders' equity	$ 925,255	$ 925,946