Derivative Financial Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 28,540	$ 32,300
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency option contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	79,400	38,000
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Foreign currency exchange contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	27,419	0
Not Designated as Hedging Instrument [Member] | Foreign currency exchange contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	0	1,950
Not Designated as Hedging Instrument [Member] | Foreign currency option contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	0	4,000
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 161,968	$ 183,851
Not Designated as Hedging Instrument [Member] | Fuel hedge contracts [Member]
Derivatives, Fair Value [Line Items]
Nonmonetary Notional Amount (in thousands of barrels)	0	38,000