Derivative Financial Instruments (Details 2) (Foreign currency forward contracts, USD $)	12 Months Ended
	Dec. 31, 2013 Cash flow hedges	Dec. 31, 2012 Cash flow hedges	Dec. 31, 2013 Not designated as hedges	Dec. 31, 2011 Not designated as hedges	Dec. 31, 2012 Not designated as hedges
Derivative Financial Instruments
Notional Amount	$ 37,040,000	$ 49,750,000	$ 45,500,000		$ 60,500,000
Realized Losses			1,800,000	1,900,000
Unrealized Loss	$ 234,000	$ 22,000