Derivatives Notional Amounts - Not Designated as Hedges (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Notional Amount		$ 166,424		$ 47,400
Gain (Loss)		243		(78)
Forward exchange contracts—net
Derivative [Line Items]
Gain (Loss)	$ (202)		$ (214)
AUD / USD
Derivative [Line Items]
Notional Amount		4,500		10,000
Gain (Loss)		(177)		(94)
CAD / USD
Derivative [Line Items]
Notional Amount		11,000		8,000
Gain (Loss)		169		(50)
EUR / USD
Derivative [Line Items]
Notional Amount		0		10,000
Gain (Loss)		0		104
DKK / USD
Derivative [Line Items]
Notional Amount		94,900		0
Gain (Loss)		321		0
GBP / USD
Derivative [Line Items]
Notional Amount		0		7,000
Gain (Loss)		0		40
NZD / USD
Derivative [Line Items]
Notional Amount		580		4,500
Gain (Loss)		(3)		(101)
EUR / CAD
Derivative [Line Items]
Notional Amount		1,944		0
Gain (Loss)		(54)		0
EUR / GBP
Derivative [Line Items]
Notional Amount		3,500		0
Gain (Loss)		(47)		0
AUD / NZD
Derivative [Line Items]
Notional Amount		7,000		7,900
Gain (Loss)		(16)		23
EUR / SEK
Derivative [Line Items]
Notional Amount		43,000		0
Gain (Loss)		$ 50		$ 0