Shareholders' Equity Share-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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	999,096		999,096
Total share-based compensation expense	$ 782	$ 683	$ 1,475	$ 1,355
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			2 years 3 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value	$ 0	$ 0	$ 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	696,819	723,964	731,809	520,987
Restricted stock granted during the period	32,555	29,175	263,829	457,538
Restricted stock vested during the period	(32,777)	(17,916)	(299,041)	(243,302)
Restricted stock outstanding as of end of the period	696,597	735,223	696,597	735,223
Nonvested restricted stock, fair value remaining to be amortized	$ 4,987		$ 4,987