Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Derivative, Gain on Derivative		$ 1,500
Derivative, Loss on Derivative	$ 2,300		$ 2,600	$ 7,100
Notional amounts of foreign currency forward contracts	93,293		93,293		$ 95,896
Euro
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	29,167		29,167		61,452
Canadian Dollar
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	27,003		27,003		19,685
United Kingdom, Pounds
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	14,356		14,356		609
Brazil, Brazil Real
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	9,048		9,048		8,598
Swedish Kronor
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	5,989		5,989		3,608
Norway, Krone
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	6,462		6,462		255
Australian Dollar
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	676		676		1,131
Other
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	592		592		$ 558
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Loss on Derivative			2,300
Interest Rate Swap [Member] | Swedish Kronor
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	$ 1,355,400		$ 1,355,400