CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowances (in dollars)	$ 5,052	$ 5,957
Other accounts receivable, allowances (in dollars)	$ 1,264	$ 1,226
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	27,140,482	27,099,819
Treasury stock, at cost, shares	1,677,932	1,677,932