Stock Based Compensation Stock Based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	3,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,903,245
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 142	$ 700	$ 1,600
Allocated Share-based Compensation Expense	3,300	3,200	$ 2,700
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 7,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 11 months
Stock Units Awarded Under the 2009 LTIP Plan	15,000		17,500
Value of Stock Units Awarded Under the 2009 LTIP Plan	$ 300	300	$ 400
Total Numbner of Units Outstanding Under the 2006 Director Equity Plan	8,059
Value of Units Outstanding Under the 2006 Director Equity Plan	$ 200
Deferred Compensation Liability, Current and Noncurrent	100	300	400
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	5,482	5,473
Stock or Unit Option Plan Expense	$ 200	$ 0	$ 200
Total Stock Units Outstanding Under All Stock Option Plans	46,049
Total Value of Units Outstanding Under All Stock Option Plans	$ 1,000
Deferred Compensation Equity	1,600
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	$ 1,100