CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEETS
Receivables, allowance (in dollars)	$ 1,646	$ 1,362
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, shares authorized	100,000,000	100,000,000
Common shares, shares issued	56,799,893	56,450,632
Treasury stock, shares	6,435,860	6,415,176