Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) classOfCommonStock vote $ / shares shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 shares
Class of Stock [Line Items]
Number of classes of common stock | classOfCommonStock	2
Purchase of treasury shares | $	$ 24,375
Treasury Stock
Class of Stock [Line Items]
Purchases of common stock (in shares)	285,286
Purchase of treasury shares | $	$ 24,375
Common Class A
Class of Stock [Line Items]
Number of votes entitled to shareholders per share of common stock | vote	1
Common stock, par or stated value per share (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Common stock, capital shares reserved for future issuance (in shares)		1,600,000
Common Class A | IPO | Number of Shares Reduced
Class of Stock [Line Items]
Common stock, capital shares reserved for future issuance (in shares)			1,600,000
Common Class A | Selling Stockholders Public Offering
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	1,600,000
Sale of stock, price per share (in dollars per share) | $ / shares	$ 75.9656
Common Class B
Class of Stock [Line Items]
Number of votes entitled to shareholders per share of common stock | vote	10
Common stock, par or stated value per share (in dollars per share) | $ / shares	$ 0.001	$ 0.001