Share-Based Compensation Plan (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		3 Months Ended							0 Months Ended	3 Months Ended		0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Restricted Stock [Member]	Mar. 31, 2013 Restricted Stock [Member]	Mar. 31, 2014 Restricted Stock [Member] Minimum [Member]	Mar. 31, 2014 Restricted Stock [Member] Maximum [Member]	Mar. 31, 2014 Performance Shares [Member]	Mar. 31, 2013 Performance Shares [Member]	Mar. 31, 2014 LongTermIncentivePartnershipUnitsClassA [Member]	Dec. 13, 2013 LongtermincentivepartnershipunitsclassB [Member]	Mar. 31, 2014 Long Term Incentive Partnership Units [Member]	Mar. 31, 2013 Long Term Incentive Partnership Units [Member]	Feb. 08, 2012 February 2012 [Member] Performance Shares [Member]	Jan. 30, 2013 January 2013 [Member] Performance Shares [Member]	Dec. 13, 2013 December 2013 [Member] Performance Shares [Member]	Feb. 04, 2014 February 2014 [Member] Performance Shares [Member]	Feb. 04, 2014 February 2014 [Member] Performance Shares [Member] Minimum [Member]	Feb. 04, 2014 February 2014 [Member] Performance Shares [Member] Maximum [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Share-based award vesting period	6 years				3 years	5 years
Number of common shares available for issuance under the 2009 Equity Incentive Plan	940,553
Allocated Share-based Compensation Expense			$ 0.3	$ 0.4			$ 1.6	$ 0.4			$ 0.7	$ 0.4
Total unrecognized compensation cost			3.2				12.2				7.4
Weighted average remaining vesting period (in years)			3 years 1 month				3 years 1 month				2 years 6 months
Share-based equity award grant			44,322										72,056	72,118	252,088	66,483
Estimated Shares Expected to Vest Minimum and Maximum																	0.00%	200.00%
Shares Expected to Vest Not Subject to Maximum													12,048	11,753		12,261
Value of LTIP grants per share									$ 8.50	$ 29.19
LTIP Units Granted										226,882
Grant date fair value of performance-based equity awards										$ 6.6
Operating Partnership outstanding	607,991	607,991
LTIP units, vested	195,290								195,290