Common Stock (Tables)

12 Months Ended

Dec. 31, 2014

Stockholders' Equity Note [Abstract]

Dividends Declared [Table Text Block]

The Company declared the following dividends for the year ended December 31:

	2014		2013		2012
Dividends paid per common share	$	1.27	$	1.22	$	1.16

Schedule Of Shares Issued Under Sales Agency Agreement

	2014	2013	2012
Shares issued under sales agency agreement	—	—	931,191