Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Allowances on accounts receivable	$ 512	$ 639
Series D Cumulative Redeemable Preferred Shares, liquidation preference	$ 25
Series D Cumulative Redeemable Preferred Shares, shares authorized	5,060,000	1,840,000
Series D Cumulative Redeemable Preferred Shares, shares outstanding	4,820,000	1,600,000
Common Shares, par value	$ 1	$ 1
Common Shares, shares issued	33,053,502	33,041,034
Common Shares, shares outstanding	33,053,502	33,041,034
Common Shares, shares authorized	unlimited	unlimited