Earnings Per Share (Narrative) (Details) (Convertible Senior Notes 2032 [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Convertible Senior Notes 2032 [Member]
Debt Instrument [Line Items]
Per share conversion price	$ 25.02	$ 25.02	$ 25.02	$ 25.02
Convertible debt stock price trigger	$ 32.53	$ 32.53	$ 32.53	$ 32.53
Incremental common shares attributable to dilutive effect of conversion of debt securities	0	0	0	0