Financial Instruments (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Offsetting Assets [Line Items]
Margin Deposit Assets	$ 2,500		$ 2,500		$ 100
Derivative Asset, Fair Value, Amount Offset Against Collateral	7,200		7,200		3,800
Largest Customer [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Offsetting Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 139,800		480,700
Largest Customer [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]
Offsetting Assets [Line Items]
Concentration Risk, Percentage	12.00%
Largest Customer [Member] | Supplier Concentration Risk [Member] | Cost of Sales [Member]
Offsetting Assets [Line Items]
Purchases of Product	$ 142,800		296,300
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Offsetting Assets [Line Items]
Derivative, Notional Amount	521,300		521,300		524,300
Derivative, Gain (Loss) on Derivative, Net	31	$ 300	(2,200)	$ 1,500
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Offsetting Assets [Line Items]
Derivative, Notional Amount					56,100
Derivative, Gain (Loss) on Derivative, Net	(800)	$ 1,000	500	$ (5,500)
Other Liabilities [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Offsetting Assets [Line Items]
Derivative Liability	$ 3,600		$ 3,600		1,500
Other Current Liabilities [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Offsetting Assets [Line Items]
Derivative Liability					$ 3,000