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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
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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 net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82918529&loc=d3e30304-110892 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,d) -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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