Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 7,300		$ (4,700)
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	100
Derivative, Notional Amount	662,100		$ 494,600
June 2019 4 Year Cross Currency Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Line Of Credit Facility Forecasted Borrowing Amount	$ 50,000
Derivative, Fixed Interest Rate	0.82%
June 2019 2 Year Cross Currency Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Line Of Credit Facility Forecasted Borrowing Amount	$ 50,000
Derivative, Fixed Interest Rate	0.95%
February 2019 Cross Currency Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Line Of Credit Facility Forecasted Borrowing Amount	$ 50,000
Derivative, Fixed Interest Rate	0.78%
2.52% $50 Million Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Line Of Credit Facility Forecasted Borrowing Amount	$ 50,000
Derivative, Fixed Interest Rate	2.52%
2.25% $100 Million Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Line Of Credit Facility Forecasted Borrowing Amount	$ 100,000
Derivative, Fixed Interest Rate	2.25%
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness	$ 0	$ 0
Cross Currency Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness	$ 0	$ 0