Consolidated Balance Sheets Parenthetical $ in Thousands	Mar. 31, 2020 USD ($) shares	Mar. 31, 2020 € / shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 € / shares
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts | $	$ 2,436		$ 2,730
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	44,796,252		44,796,252
Common shares, outstanding	44,444,177		44,465,562
Treasury stock, shares	352,075		330,690