Equity and Accumulated Other Comprehensive Income (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 10, 2013
Equity, Class of Treasury Stock [Line Items]
Purchase of common shares, value	$ 30,700,000
Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount		$ 125,000,000
Prior Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Purchase of common shares, value	$ 30,700,000
Repurchase of common shares, shares	1,000,000
Average cost per share	$ 30.73