Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on Euro-denominated notes, tax expense (benefit)	$ 564	$ 1,148	$ (4,555)
Unrealized gain (loss) on investments, tax expense (benefit)	84	(40)	0
Unrealized gain (loss) on foreign currency exchange contracts, tax expense (benefit)	362	2,529	(5,304)
Unrealized gain (loss) on cross currency swaps, tax expense (benefit)	664	323	0
Reclassification adjustment for (gains) losses included in net income, tax (expense) benefit	$ (2,467)	$ 187	$ 224