Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Allowances on accounts receivable	$ 639	$ 262
Series B-1 Cumulative Convertible Redeemable Preferred Shares, liquidation preference		$ 25
Series B-1 Cumulative Convertible Redeemable Preferred Shares, shares authorized		852,000
Series B-1 Cumulative Convertible Redeemable Preferred Shares, shares outstanding		852,000
Series C Cumulative Convertible Redeemable Preferred Shares, liquidation preference		$ 25
Series C Cumulative Convertible Redeemable Preferred Shares, shares authorized		144,000
Series C Cumulative Convertible Redeemable Preferred Shares, shares outstanding		144,000
Series D Cumulative Redeemable Preferred Shares, liquidation preference	$ 25
Series D Cumulative Redeemable Preferred Shares, shares authorized	1,840,000
Series D Cumulative Redeemable Preferred Shares, shares outstanding	1,600,000
Common shares, par value	$ 1	$ 1
Common shares, shares issued	33,041,034	27,030,186
Common shares, shares outstanding	33,041,034	27,030,186
Common Shares Authorized	unlimited	unlimited