Derivative Financial Instruments Schedule of Fair Value by Balance Sheet Location (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Derivatives, Fair Value [Line Items]
Derivative asset	$ 150,700
Derivative liability	70,900
Over the counter | Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	111,200
Over the counter | Not Designated as Hedging Instrument | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	105,800
Exchange traded | Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0
Exchange traded | Not Designated as Hedging Instrument | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	400
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	111,235
Cash collateral	(33,911)
Derivative Liabilities	106,175
Cash collateral	(20,272)
Foreign exchange contracts | Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	111,200
Cash collateral	(33,900)
Derivative asset	77,300
Foreign exchange contracts | Not Designated as Hedging Instrument | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	106,200
Cash collateral	(20,300)
Derivative liability	$ 85,900