Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on Euro-denominated notes, tax expense (benefit)	$ (2,325)	$ 564	$ 1,148
Unrealized gain (loss) on investments, tax expense (benefit)	(120)	84	(40)
Unrealized gain (loss) on foreign currency exchange contracts, tax expense (benefit)	(2,013)	362	2,529
Unrealized gain (loss) on cross currency swaps, tax expense (benefit)	(1,774)	664	323
Reclassification adjustment for (gains) losses included in net income, tax (expense) benefit	$ (158)	$ (2,467)	$ 187