Stock Based Compensation Stock Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 2,200,000	$ 2,600,000	$ 1,100,000
Allocated Share-based Compensation Expense	2,300,000	1,700,000	1,900,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	5,600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months 2 days
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	0	0	233,000
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
Stock Units Awarded Under the 2009 LTIP Plan	10,500	7,000	6,000
Closing Price of common shares on grant date	$ 26.42
Value of Stock Units Awarded Under the 2009 LTIP Plan	300,000	100,000	100,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	400,000	100,000	100,000
Stock or Unit Option Plan Expense	(300,000)	(600,000)	(300,000)
Total Stock Units Outstanding Under All Stock Option Plans	77,663
Total Value of Units Outstanding Under All Stock Option Plans	1,800,000
Deferred Compensation Equity	2,000,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	$ 1,000,000