Derivative Financial Instruments (Fair Value of Derivative Instruments Included in Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivatives designated as hedging instruments \| Interest rate swap contracts \| Accrued liabilities
Derivatives designated as hedging instruments:
Interest rate swap contracts liabilities	$ 1,793	$ 2,403
Derivatives not designated as hedging instruments \| Foreign currency derivatives \| Prepaid expenses and other current assets
Derivatives not designated as hedging instruments:
Foreign currency derivative assets	180	300
Derivatives not designated as hedging instruments \| Foreign currency derivatives \| Other assets
Derivatives not designated as hedging instruments:
Foreign currency derivative assets	227	367
Derivatives not designated as hedging instruments \| Foreign currency derivatives \| Accrued liabilities
Derivatives not designated as hedging instruments:
Foreign currency derivative liabilities	954	1,084
Derivatives not designated as hedging instruments \| Foreign currency derivatives \| Other liabilities
Derivatives not designated as hedging instruments:
Foreign currency derivative liabilities	$ 1,962	$ 2,431

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- Definition

Fair value as of the balance sheet date of all foreign currency derivative assets not designated 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 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

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- Definition

Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

+ References

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- Definition

Fair value as of the balance sheet date of all derivative assets designated as interest rate fair value 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 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

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- References

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