Derivative Financial Instruments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) derivative_instrument	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Derivative [Line Items]
Gross amount assets	$ 324,000	$ 152,000
Foreign currency forward contracts | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Approximate number of derivatives per quarter | derivative_instrument	10
Notional amount	$ 2,000,000.0
Foreign currency forward contracts | Cash Flow Hedges
Derivative [Line Items]
Approximate number of derivatives per quarter | derivative_instrument	10
Notional amount	$ 6,000,000.0
Estimated term of reclassification from OCI to Income	12 months	12 months	12 months
Offsetting derivative assets and liabilities
Derivative [Line Items]
Gross amount assets	$ 300,000
Gross amount liabilities	2,400,000
Net of offset assets	0
Net of offset liabilities	$ 2,100,000
Maximum | Foreign currency forward contracts
Derivative [Line Items]
Term of derivative contracts	6 months
Maximum | Foreign currency forward contracts | Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Term of derivative contracts	3 months
Maximum | Foreign currency forward contracts | Cash Flow Hedges
Derivative [Line Items]
Term of derivative contracts	6 months