Derivatives and Hedging Instruments - Foreign Currency Forward Contracts (Details) - Not Designated as Hedging Instrument - Foreign Exchange Forward - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross Notional Amount	$ 153,563	$ 411,718
Assets	1,369	5,086
Liabilities	4,106	683
Gains (losses) on non-qualifying hedges charged to earnings	13,207	31,643
Australia, Dollars
Derivative [Line Items]
Gross Notional Amount	913	45,427
Assets	839	1,952
Liabilities	892	310
Gains (losses) on non-qualifying hedges charged to earnings	1,523	4,958
Canada, Dollars
Derivative [Line Items]
Gross Notional Amount	66,266	55,050
Assets	10	1,441
Liabilities	1,482	0
Gains (losses) on non-qualifying hedges charged to earnings	(2,079)	9,311
Euro Member Countries, Euro
Derivative [Line Items]
Gross Notional Amount	74,444	54,282
Assets	507	139
Liabilities	1,440	301
Gains (losses) on non-qualifying hedges charged to earnings	1,759	2,296
United Kingdom, Pounds
Derivative [Line Items]
Gross Notional Amount	11,940	256,959
Assets	13	1,554
Liabilities	292	72
Gains (losses) on non-qualifying hedges charged to earnings	$ 12,004	$ 15,078

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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