Foreign Currency Exchange Contracts and Hedging (Details) (USD $)	3 Months Ended		3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Foreign currency exchange contracts counterparty	Mar. 31, 2014 Derivatives designated as cash flow hedges Foreign currency exchange contracts	Mar. 31, 2013 Derivatives designated as cash flow hedges Foreign currency exchange contracts	May 12, 2014 Non-designated derivatives Subsequent Event	Mar. 31, 2014 Non-designated derivatives Foreign currency exchange contracts	Dec. 31, 2013 Non-designated derivatives Foreign currency exchange contracts
Foreign currency exchange contracts and hedging
Derivative, Notional Amount					$ 10,000,000	$ 64,000,000	$ 77,000,000
Remaining maturity of outstanding foreign currency forward contracts, maximum						9 months
Number of counterparties in derivative contracts		4
Estimate of time to transfer	12 months
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)			(47,000)	2,491,000
Reclassified from AOCI into Income (Effective Portion)			(283,000)	0
Gain (Loss) from Amount Excluded from Effectiveness Testing			$ (31,000)	$ (33,000)