Long-term Equity-based Compensation Plans Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan, Activity (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Outstanding, Number, Beginning of Year	4,000
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Outstanding, Weighted Average Exercise Price, Beginning of Year	$ 31.50
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Granted and Vested in Period	4,000
Share-based Compensation Arrangements by Share-based Payment Award, Deferred Stock Units, Granted and Vested in Period, Weighted Average Exercise Price	$ 37.53
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Outstanding, Number, End of Period	8,000
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Outstanding, Weighted Average Exercise Price, End of Period	$ 34.52