Derivatives and Hedging Instruments - Effects of Derivatives in Cash Flow Hedging Relationships (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ 168	$ (4,268)	$ (5,915)
Designated as Hedging Instrument \| Foreign currency exchange contracts \| Cash Flow Hedges \| Salaries and employee benefits
Derivative [Line Items]
Gain (Loss) Recognized in OCI	(341)	1,100
Gain (Loss) Reclassified from OCI into Income	49	383
Designated as Hedging Instrument \| Foreign currency exchange contracts \| Cash Flow Hedges \| General and administrative expenses
Derivative [Line Items]
Gain (Loss) Recognized in OCI	(44)	(56)
Gain (Loss) Reclassified from OCI into Income	11	(19)
Designated as Hedging Instrument \| Interest rate swap agreements \| Cash Flow Hedges \| Interest Expense
Derivative [Line Items]
Gain (Loss) Recognized in OCI	(7,441)	(6,347)
Gain (Loss) Reclassified from OCI into Income	(7,893)	(2,560)
Designated as Hedging Instrument \| Interest rate cap contracts \| Cash Flow Hedges \| Interest Expense
Derivative [Line Items]
Gain (Loss) Recognized in OCI	(3,001)	(1,752)
Gain (Loss) Reclassified from OCI into Income	(2,846)	146
Designated as Hedging Instrument \| Cross-currency swap agreements \| Cash Flow Hedges \| Interest Expense / Other Income
Derivative [Line Items]
Gain (Loss) Recognized in OCI	10,503	0
Gain (Loss) Reclassified from OCI into Income	$ 10,121	$ 0

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Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

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