CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Accounts receivable, allowance	$ 9,126	$ 12,193
PROPERTY, EQUIPMENT AND FACILITIES - accumulated depreciation and amortization	122,037	136,910
OTHER ASSETS :
Noncurrent receivables, allowance	$ 797	$ 1,016
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)	29,727,555	29,933,086
Common stock, shares outstanding (in shares)	29,727,555	29,933,086
Treasury stock, shares (in shares)	5,910,541	5,910,541