Stock-Based Compensation Plans (Vesting of Restricted Stock Narrative) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based Compensation Plans Vesting Of Restricted Stock Narrative Details
Deferred stock units granted to directors for services, which did not contain any vesting restrictions	7,136	35,097	20,334
Deferred stock units granted to directors for services, vesting over one year	27,432	75,940	106,575
Deferred stock units outstanding	649,642
Shares of restricted stock granted to employees which will vest over a period of one to three years	328,916	317,212	307,720
Restricted stock granted to employees	30,412	141,507	0