Shareholders' Equity Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014		Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based incentive plan, number of shares authorized for issuance	2,500,000			2,500,000
Share-based incentive plan, number of shares remaining for issuance	994,096			994,096
Total share-based compensation expense	$ 745	$ 690		$ 2,220	$ 2,045
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 9 months 24 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value				$ 2,167	$ 3,703
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Restricted stock outstanding as of beginning of the period	696,597	735,223	[1]	731,809	520,987	[1]
Restricted stock granted during the period	0	0		263,829	457,538
Restricted stock vested during the period	0	(3,414)	[1]	(299,041)	(246,716)	[1]
Restricted stock outstanding as of end of the period	696,597	731,809	[1]	696,597	731,809	[1]
Nonvested restricted stock, fair value remaining to be amortized	$ 4,242			$ 4,242

[1] Amounts shown for the three and nine months ended September 30, 2014 have been adjusted from amounts previously disclosed to correct computational errors relating to vesting terms on grants made in the first quarter of 2013.