Accounting for Stock-based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended			24 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Non-vested Beginning Balance	284,826	303,836	305,399	305,399
Number of Shares, Granted	89,388	148,361	132,757
Number of Shares, Vested	(93,881)	(140,666)	(119,203)
Number of Shares, Cancelled	(21,815)	(26,705)	(15,117)
Number of Shares, Non-vested Ending Balance	258,518	284,826	303,836	284,826
Number of Shares, expected to vest in the future	230,953
Weighted-Average Grant Date Fair Value, Non-vested Beginning Balance	$ 88.23	$ 79.17	$ 66.51	$ 66.51
Weighted-Average Grant Date Fair Value, Granted	110.80	93.70	95.68
Weighted-Average Grant Date Fair Value, Vested	78.05	76.53	66.46
Weighted-Average Grant Date Fair Value, Cancelled	94.01	77.16	68.53
Weighted-Average Grant Date Fair Value, Non-vested Ending Balance	99.25	$ 88.23	$ 79.17	$ 88.23
Weighted-Average Grant Date Fair Value, expected to vest in the future	$ 98.82
Aggregate Intrinsic Value, Non-vested	$ 34,665
Aggregate Intrinsic Value, expected to vest in the future	$ 30,968