Stockholders' Equity (Stock Rollforward) (Details)			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Common Stock	Mar. 31, 2013 Treasury Stock
Increase (Decrease) in Stock by Class [Roll Forward]
Common stock, shares issued, beginning of period	11,167,721	11,155,648.000	11,155,648
Treasury stock, shares, beginning of period	599,574	607,688.000		607,688
Changes related to stock-based compensation awards:
Release of restricted common shares, common stock			7,611
Release of restricted common shares, treasury stock				704
Changes related to deferred compensation plan:
Purchase of treasury stock				712
Re-issuance of treasury stock				(7,703)
Common shares issued under dividend reinvestment plan			4,462
Common shares issued under Board of Directors' compensation plan			0	(1,827)
Common stock, shares issued, end of period	11,167,721	11,155,648.000	11,167,721
Treasury stock, shares, end of period	599,574	607,688.000		599,574