CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Accounts receivable, allowance	$ 9,255	$ 9,126
PROPERTY, EQUIPMENT AND FACILITIES - accumulated depreciation and amortization	121,938	122,037
OTHER ASSETS :
Noncurrent receivables, allowance	$ 734	$ 797
LIABILITIES AND STOCKHOLDERS' EQUITY
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	29,666,077	29,727,555
Common stock, shares outstanding (in shares)	29,666,077	29,727,555
Treasury stock, shares (in shares)	5,910,541	5,910,541