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Stock Based Compensation - Restricted and Unrestricted Shares with Market Conditions (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2011	Dec. 31, 2015	Dec. 31, 2014
Relative TSR [Member] | Restricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted and Unrestricted Share Awards, Grant Date Fair Value	$ 458	$ 191
Unamortized Value Of Restricted and Unrestricted Shares		144	$ 161
Relative TSR [Member] | Unrestricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted and Unrestricted Share Awards, Grant Date Fair Value	1,376	634
Unamortized Value Of Restricted and Unrestricted Shares		383	0
Absolute TSR [Member] | Restricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted and Unrestricted Share Awards, Grant Date Fair Value	327	76
Unamortized Value Of Restricted and Unrestricted Shares		57	111
Absolute TSR [Member] | Unrestricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted and Unrestricted Share Awards, Grant Date Fair Value	$ 921	254
Unamortized Value Of Restricted and Unrestricted Shares		$ 153	$ 0

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