Stock Based Compensation Stock Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	2,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,255,171
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 1,600,000	$ 2,200,000	$ 2,600,000
Allocated Share-based Compensation Expense	2,700,000	2,000,000	1,600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	7,500,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months 12 days
Stock Units Awarded Under the 2009 LTIP Plan	17,500	10,500	7,000
Value of Stock Units Awarded Under the 2009 LTIP Plan	400,000	300,000	100,000
Total Numbner of Units Outstanding Under the 2006 Director Equity Plan	16,110
Value of Units Outstanding Under the 2006 Director Equity Plan	500,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	400,000	400,000	100,000
Stock or Unit Option Plan Expense	200,000	300,000	600,000
Total Stock Units Outstanding Under All Stock Option Plans	88,131
Total Value of Units Outstanding Under All Stock Option Plans	1,900,000
Deferred Compensation Equity	2,000,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	$ 1,300,000