Stock Compensation Plans (Performance Share Activity) (Details) (Performance Shares [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares at beginning of year	359,700	351,345	325,700
Performance shares granted	175,000	181,000	184,600
Shares canceled	(13,298)	(4,544)	(2,177)
Shares vested	(176,718)	(168,101)	(156,778)
Unvested shares at end of year	344,684	359,700	351,345
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested	$ 9,717	$ 8,672	$ 9,047
Unrecognized compensation expense	$ 3,651	$ 3,800	$ 2,991