Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts receivable, allowance for doubtful accounts	$ 4,849	$ 4,535
Accounts receivable, allowance for appeals	$ 6,614	$ 4,824
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	125,000,000	125,000,000
Common stock, shares issued (in shares)	95,263,461	94,511,444
Common stock, shares outstanding (in shares)	83,989,715	87,985,139
Treasury stock, shares (in shares)	11,273,746	6,526,305