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Derivative instruments (Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)) (Details) - Cash Flow Hedging - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	$ 17,908	$ 11,933	$ (18,813)
(Gain) Loss Reclassified from Accumulated OCI into Income (Effective Portion)	(31,969)	59	11,242
(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion)	(679)	(101)	0
Income (loss) adjustment to foreign exchange	28,588	7,532	(6,997)
Net interest expense	(9,700)	(9,497)	(2,938)
Forward Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	731	(1,344)	(1,861)
(Gain) Loss Reclassified from Accumulated OCI into Income (Effective Portion)	(75)	1,236	1,307
(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion)	0	0	0
Cross-Currency Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	11,279	5,828	(16,952)
(Gain) Loss Reclassified from Accumulated OCI into Income (Effective Portion)	(18,888)	1,965	9,935
(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion)	0	0	0
Call Spread
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	4,034	21,047	0
(Gain) Loss Reclassified from Accumulated OCI into Income (Effective Portion)	(15,421)	2,791	0
(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion)	0	0	0
Coupon-only Swap
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	1,864	(13,598)	0
(Gain) Loss Reclassified from Accumulated OCI into Income (Effective Portion)	2,415	(5,933)	0
(Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion)	$ (679)	$ (101)	$ 0

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- Definition

The effective portion of loss (gain) reclassified from accumulated other comprehensive income to the statement of income within net interest expense.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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