Derivatives Notional Amounts - Not Designated as Hedges (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative [Line Items]
Notional Amount	$ 181,835		$ 47,400
Gain (Loss)	(724)		(78)
Forward exchange contracts—net
Derivative [Line Items]
Gain (Loss)		$ (12)
AUD / USD
Derivative [Line Items]
Notional Amount	4,000		10,000
Gain (Loss)	239		(94)
CAD / USD
Derivative [Line Items]
Notional Amount	8,000		8,000
Gain (Loss)	(167)		(50)
EUR / USD
Derivative [Line Items]
Notional Amount	7,000		10,000
Gain (Loss)	(342)		104
DKK / USD
Derivative [Line Items]
Notional Amount	94,900		0
Gain (Loss)	165		0
GBP / USD
Derivative [Line Items]
Notional Amount	0		7,000
Gain (Loss)	0		40
NOK / USD
Derivative [Line Items]
Notional Amount	59,200		0
Gain (Loss)	(688)		0
NZD / USD
Derivative [Line Items]
Notional Amount	835		4,500
Gain (Loss)	64		(101)
AUD / NZD
Derivative [Line Items]
Notional Amount	7,900		7,900
Gain (Loss)	$ 5		$ 23