Hedging - Derivatives No Longer Qualifying as Hedging Instruments (Details)	9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 Transferred from Hedging to Non-hedging Instruments Euro call and put option contracts EUR (€)	Sep. 30, 2013 Foreign exchange option, settled in Q1 2013 Purchased Euro put option EUR (€)	Sep. 30, 2013 Foreign exchange option, settled in Q1 2013 Sold Euro call option EUR (€)	Sep. 30, 2013 Foreign exchange option, settled in Q2 2013 Purchased Euro put option EUR (€)	Sep. 30, 2013 Foreign exchange option, settled in Q2 2013 Sold Euro call option EUR (€)	Sep. 30, 2013 Foreign exchange option, settled in Q3 2013 Purchased Euro put option EUR (€)	Sep. 30, 2013 Foreign exchange option, settled in Q3 2013 Sold Euro call option EUR (€)
Derivative [Line Items]
Notional amount of currency derivatives included in transferred positions		€ 71,000,000	€ 25,000,000	€ 25,000,000	€ 19,000,000	€ 19,000,000	€ 27,000,000	€ 27,000,000
Deferred net gains (losses) in Accumulated other comprehensive income (loss) expected to be reclassified into income	$ 17,903,000