Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Foreign Exchange Forward Contracts Term	60 months
Amount of gain (loss) to be reclassified from AOCI	$ 39,730,000
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Foreign Exchange Forward Contracts Term	90 days
Gain in other income and expense	$ (12,969,000)	$ 6,423,000
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount of Foreign Currency Derivatives	2,088,952,000
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Fair Value, Net Asset (Liability)			$ 0
Notional Amount of Foreign Currency Derivatives	$ 307,585,000