CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowances (in dollars)	$ 5,737	$ 3,944
Other accounts receivable, allowances (in dollars)	$ 1,214	$ 1,254
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	27,099,819	26,934,847
Treasury stock, at cost, shares	1,677,932	1,677,932