Equity (Narrative) (Details) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended								12 Months Ended
	Feb. 02, 2022 $ / shares	Dec. 17, 2020 USD ($)	Feb. 08, 2019 USD ($) shares	Dec. 31, 2021 € / shares $ / shares shares	Sep. 30, 2021 $ / shares	Jun. 30, 2021 $ / shares	Mar. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 $ / shares € / shares shares	Sep. 30, 2020 $ / shares	Jun. 30, 2020 $ / shares	Mar. 31, 2020 $ / shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	May 24, 2018	Dec. 31, 1995
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Proceeds from issuance of common shares | $												$ 60,000	$ 0	$ 0
Common stock, shares, issued				46,454,264				44,796,252
Common stock, par value per share | € / shares				€ 0.02				€ 0.02
Transaction costs on the issuance of common shares | $												$ 861	0	0
Stock repurchase program, number of shares authorized to be repurchased, percent															10.00%	10.00%
Treasury stock, shares, acquired			72,339									40,091,496
Treasury stock, value, acquired, cost method | $			$ 1,800									$ 1,700,000
Treasury stock acquired, average cost per share | $ / shares												$ 41.43
Treasury stock, shares, retired												33,475,406
Treasury stock, retired, cost method, amount | $												$ 1,200,000
Treasury stock, shares				104,867				223,451
Stock repurchase program, remaining authorized repurchase amount (in shares)				4,540,559
Repurchase of common shares (shares)												300,568
Treasury stock, value | $												$ 8,256	$ 2,793	$ 3,308
Cash dividends per share (in dollar per share) | $ / shares				€ 0.01	$ 0.01	$ 0.01	$ 0.01	€ 0.01	$ 0.01	$ 0.01	$ 0.25	$ 0.04	$ 0.28	$ 2.20
Subsequent Event [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Cash dividends per share (in dollar per share) | $ / shares	$ 0.01
Dividends payable, date declared	Feb. 02, 2022
Stock Rights [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Repurchase of common shares (shares)												95,568
Treasury stock, value | $												$ 2,600
At-The-Market Offerings [Member] | Wells Fargo Securities, LLC [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Proceeds from issuance of common shares | $		$ 60,000					$ 59,100
Common stock, shares, issued							1,658,012