Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of decrease in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Derivative, Loss on Derivative	$ 600	$ 4,000	$ 300	$ 8,600
Notional amounts of foreign currency forward contracts	122,752		122,752		$ 95,896
Euro
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	71,168		71,168		61,452
Canadian Dollar
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	19,441		19,441		19,685
United Kingdom, Pounds
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	11,570		11,570		609
Brazil, Brazil Real
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	8,518		8,518		8,598
Swedish Kronor
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	5,963		5,963		3,608
Norway, Krone
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	4,295		4,295		0
Australian Dollar
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	1,054		1,054		1,131
Other
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	743		743		$ 813
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Loss on Derivative			2,100
Interest Rate Swap [Member] \| Swedish Kronor
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	$ 1,372,800		$ 1,372,800