Derivative Financial Instruments and Hedging Activities - Schedule of Derivative Instruments in Statement of Financial Position (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 688	[1]	$ 1,781	[1]
Derivative Liability	(9,377)	[1]	(4,873)	[1]
Prepaid and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	431	[1]	1,781	[1]
Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	257	[1]	0	[1]
Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(1,934)	[1]	(214)	[1]
Other non-current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(7,443)	[1]	(4,659)	[1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member] | Prepaid and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	132	[1]	915	[1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	59	[1]	0	[1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency exchange contracts [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(272)	[1]	0	[1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency option contracts [Member] | Prepaid and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	299	[1]	673	[1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency option contracts [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	198	[1]	0	[1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency option contracts [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(1,439)	[1]	(214)	[1]
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign currency option contracts [Member] | Other non-current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(196)	[1]	0	[1]
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Foreign currency exchange contracts [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(223)	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Foreign currency exchange contracts [Member] | Prepaid and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	0	[1]	25	[1]
Not Designated as Hedging Instrument [Member] | Foreign currency option contracts [Member] | Prepaid and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	0	[1]	8	[1]
Not Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Other non-current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(7,247)	[1]	(4,659)	[1]
Not Designated as Hedging Instrument [Member] | Fuel hedge contracts [Member] | Prepaid and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 0	[1]	$ 160	[1]

[1] See Note 7 — Fair Value Measurements for further information on the fair value of our derivatives including their classification within the fair value hierarchy.