Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Common shares, par value
Common shares, shares authorized	42,000	42,000	42,000
Common shares, shares issued	19,198	19,198	19,198
Preferred shares, par value
Preferred shares, shares authorized	1,000	1,000	1,000
Preferred shares, shares issued
Treasury shares, at cost	570	697	629