Derivatives (Gains and Losses on Derivatives that were Not Designated as Hedging Instruments) (Details)	3 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2014 Other Income (Expense) [Member] Currency contracts [Member] USD ($)	Mar. 31, 2013 Other Income (Expense) [Member] Currency contracts [Member] USD ($)	Mar. 31, 2014 Not Designated as Hedging Instrument [Member] Currency contracts [Member] CAD	Dec. 31, 2013 Not Designated as Hedging Instrument [Member] Currency contracts [Member] CAD
Derivative [Line Items]
Derivative, notional amount					0	0
Gain (loss) on derivatives not designated as hedging instruments	$ 0	$ 251,000	$ 0	$ 251,000