Derivative Instruments - Notational Amounts and Maturity Dates of Derivative Instruments (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Interest Rate Swap Maturing December 2020 | Interest rate swaps
Derivative [Line Items]
Notational amount	$ 200,000,000	$ 200,000,000
Foreign Exchange Forward Contract Maturing Various Dates Through September 2020 | Foreign exchange contracts
Derivative [Line Items]
Notational amount	343,665,000	388,930,000
Foreign Exchange Forward Contract Maturing Various Dates In 2020, 2022, 2028 | Foreign exchange contracts
Derivative [Line Items]
Notational amount	$ 83,126,000	$ 125,979,000