Consolidated Balance Sheets Parenthetical $ in Thousands	Mar. 31, 2021 USD ($) shares	Mar. 31, 2021 € / shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2020 € / shares
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts | $	$ 3,919		$ 4,068
Preferred stock, par value per share | € / shares		€ 0.02		€ 0.02
Preferred stock, shares authorized	6,000,000		6,000,000
Preferred stock, shares issued	0		0
Preferred stock, shares outstanding	0		0
Common stock, par value per share | € / shares		€ 0.02		€ 0.02
Common stock, shares authorized	200,000,000		200,000,000
Common stock, shares, issued	46,454,264		44,796,252
Common shares, outstanding	46,240,481		44,572,801
Treasury stock, shares	213,783		223,451