Foreign Currency Exchange Contracts and Hedging (Details) (Foreign currency exchange contracts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Foreign currency exchange contracts and hedging
Number of Counterparties in Derivative Contracts	4
Maximum Remaining Maturity of Foreign Currency Derivatives	12 months
Non-designated derivatives
Foreign currency exchange contracts and hedging
Notional amounts of foreign currency hedging contracts	$ 77,000	$ 19,000
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of Gain (Loss) Recognized in Income on Derivatives	728	1,030
Derivatives designated as cash flow hedges
Summary of the effect of derivative instruments on the consolidated statements of income
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	(779)	(1,191)
Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	17	617
Gain (Loss) from Amount Excluded from Effectiveness Testing	$ (11)	$ 26