CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowances (in dollars)	$ 4,825	$ 5,731
Other accounts receivable, allowances (in dollars)	$ 1,029	$ 1,701
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	70,000,000	70,000,000
Common stock, issued shares	27,938,319	27,722,010
Treasury stock, at cost, shares	2,080,187	1,677,932