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Incentive Plans (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2011 Restricted Stock [Member]	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2011 Restricted Stock [Member]	Jun. 30, 2012 Restricted Op Units [Member]	Jun. 30, 2011 Restricted Op Units [Member]	Jun. 30, 2012 Restricted Op Units [Member]	Jun. 30, 2011 Restricted Op Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,181,184	1,934,204
Unearned Compensation			$ 4.1		$ 4.1		$ 0.8		$ 0.8
Amortization Of Restricted Equity Incentive Compensation			$ 0.5	$ 0.1	$ 0.8	$ 0.2	$ 0.1	$ 0.2	$ 0.3	$ 0.3

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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