Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	$ 120,925	$ 95,896
Euro
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	69,805	61,452
Canadian Dollar
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	23,456	19,685
United Kingdom, Pounds
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	9,430	609
Brazil, Brazil Real
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	8,112	8,598
Swedish Kronor
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	6,707	3,608
Norway, Krone
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	2,097	0
Australian Dollar
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	1,205	1,131
Other
Derivative [Line Items]
Notional amounts of foreign currency forward contracts	$ 113	$ 813