Accounting for Stock-based Compensation - Cash-settled Restricted Stock Unit Activity (Details) - Cash Settled RSUs - USD ($)	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	188,419	166,260	241,481	241,481
Number of Shares, Granted	70,742	115,024	52,246
Number of Shares, Vested	(81,537)	(75,566)	(104,272)
Number of Shares, Cancelled	(19,040)	(17,299)	(23,195)
Number of Shares, Non-vested Ending Balance	158,584	188,419	166,260	188,419
Number of Shares, expected to vest in the future	134,808
Weighted-Average Grant Date Fair Value, Non-vested Beginning Balance	$ 87.28	$ 72.79	$ 65.06	$ 65.06
Weighted-Average Grant Date Fair Value, Granted	110.65	97.88	89.51
Weighted-Average Grant Date Fair Value, Vested	76.26	73.20	63.96
Weighted-Average Grant Date Fair Value, Cancelled	91.94	80.02	69.68
Weighted-Average Grant Date Fair Value, Non-vested Ending Balance	102.82	$ 87.28	$ 72.79	$ 87.28
Weighted-Average Grant Date Fair Value, expected to vest in the future	$ 102.31
Aggregate Intrinsic Value, Non-vested	$ 21,264,000
Aggregate Intrinsic Value, expected to vest in the future	$ 18,076,000