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Accumulated Other Comprehensive Income (Details) $ in Thousands, € in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	May 31, 2018 EUR (€)
Components of comprehensive income
Net income	$ 5,544	$ 5,128
Mark to market of foreign exchange hedges	(8)	(26)
Deferred income tax (expense) benefit	2	6
Comprehensive income	$ 5,538	$ 5,108
Foreign exchange hedges liabilities				$ (9)	$ (1)
Foreign Exchange Contract
Components of comprehensive income
Foreign exchange hedges liabilities \| €			€ (0.3)
Foreign Exchange Contract \| Designated as Hedging Instrument
Components of comprehensive income
Notional amount \| €						€ 2.2