Benefit Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended				12 Months Ended			48 Months Ended	132 Months Ended		12 Months Ended		48 Months Ended	132 Months Ended		12 Months Ended	132 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2008 Minimum [Member] 2008 Options [Member]	Dec. 31, 2008 Maximum [Member] 2008 Options [Member]	Dec. 31, 2008 Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger [Member] 2008 Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2010 2010 Options [Member]	Dec. 31, 2015 2010 Options [Member]	Dec. 31, 2020 2010 Options [Member]	Sep. 30, 2011 2010 Options [Member]	Jan. 08, 2010 2009 Options [Member]	Dec. 31, 2009 2009 Options [Member] years	Dec. 31, 2014 2009 Options [Member]	Dec. 31, 2019 2009 Options [Member]	Sep. 30, 2011 2009 Options [Member]	Dec. 31, 2008 2008 Options [Member] days years	Dec. 31, 2018 2008 Options [Member]	Sep. 30, 2011 2008 Options [Member]	Dec. 31, 2009 2008 Options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Common Share Options Granted							1,248,501				1,265,500					2,000,000
Common Share Options Exercise Price							$ 7.95				$ 6.39					$ 5.60
Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate					50.00%	20.00%					20.00%
Number Of Trading Period Days Where Entitys Average Closing Price Per Common Share Is Greater Than The Stated Lower Amount Triggering Vesting																20
Stated Lower Amount Where Entitys Average Closing Price Per Common Share Is Greater Than The Stated Amount Trigerring			$ 8.00	$ 10.00
Share Based Compensation Arrangement by Share Based Payment Award Options Convertible To Common Shares																			1.13
Options Converted To Common Shares Exercise Price																			$ 4.97
Deferred Compensation Equity										$ 2,422					$ 2,771			$ 2,480
Vesting Period								Vest 20% annually on each December 31, 2011 through 2015					Vest 20% annually on each December 31, 2010 through 2014				Vested 50% following a 20-day trading period where the average closing price of a common share of the Company on the New York Stock Exchange (“NYSE”) is $8.00 or higher and vest 50% following a 20-day trading period where the average closing price of a common share of the Company on the NYSE is $10.00 or higher
Termination Rights									Terminate on the earlier of (x) six months of termination of service with the Company and (y) December 31, 2020.					Terminate on the earlier of (x) six months of termination of service with the Company and (y) December 31, 2019
Options Expiration Date																	Expire December 2018
Recognized Compensation Expense Average Period												5.0				3.6
Recognized Compensation Expense	1,038	928
Unrecognized Compensation Costs	4,101
Share Based Compensation Expense Relating to Scheduled Vesting and Issuance of Common Share Grants	$ 1,569	$ 2,583