Derivatives And Risk Management Derivatives and Risk Management (Foreign Currency Exchange Contracts) (Details) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 derivative_contracts	Dec. 31, 2014 derivative_contracts	Mar. 31, 2015 Foreign Exchange Contract [Member] United States of America, Dollars USD ($)	Dec. 31, 2014 Foreign Exchange Contract [Member] United States of America, Dollars USD ($)	Mar. 31, 2015 Foreign Exchange Contract [Member] Canada, Dollars CAD	Dec. 31, 2014 Foreign Exchange Contract [Member] Canada, Dollars CAD
Schedule of Foreign Currency Derivative Contracts Outstanding [Line Items]
Number Of Days Canadian Currency Prices Are Settled With U.S. Dollars	60 days
Number of Foreign Currency Derivatives Held	25	18
Derivative, Notional Amount			$ 4,357	$ 5,474	5,498	6,198