Stock-Based Compensation - Status of Nonvested Restricted Stock, Stock Grants, Stock Units and Performance Shares (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units, Stock Grants, and Stock Units
Nonvested shares
Balance at the beginning of the period (in shares)	220,557
Granted (in shares)	152,345
Vested (in shares)	(115,099)
Forfeited (in shares)	(4,647)
Balance at the end of the period (in shares)	253,156	220,557
Weighted-Average Grant-Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 77.93
Granted (in dollars per share)	76.72	$ 71.70	$ 89.15
Vested (in dollars per share)	80.50
Forfeited (in dollars per share)	80.11
Balance at the end of the period (in dollars per share)	$ 79.37	$ 77.93
Vested awards outstanding at end of year (in shares)	88,706
Vested awards outstanding at end of year (in dollars per share)
Number of nonvested awards to be settled in cash (in shares)	118,538
Performance Shares
Nonvested shares
Balance at the beginning of the period (in shares)	260,004
Granted (in shares)	161,840
Vested (in shares)	(136,070)
Forfeited (in shares)	(5,092)
Balance at the end of the period (in shares)	280,682	260,004
Weighted-Average Grant-Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 98.28
Granted (in dollars per share)	82.42	$ 104.74	$ 92.16
Vested (in dollars per share)	92.16
Forfeited (in dollars per share)	95.07
Balance at the end of the period (in dollars per share)	$ 92.16	$ 98.28
Vested awards outstanding at end of year (in shares)	136,070
Vested awards outstanding at end of year (in dollars per share)