Stockholders' Equity (Schedule of Deferred and Restricted Stock Units Transactions) (Details) - Deferred and Restricted Stock Unit - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Balance at beginning of the period (in shares)	335,087	346,148	264,406
Issued (in shares)	4,653	5,703	6,073
Granted (in shares)	109,767	150,319	252,068
Dividend equivalents (in shares)	7,233	10,042	10,243
Forfeited (in shares)	(6,696)	(21,856)	(9,079)
Vested (in shares)	(164,333)	(155,269)	(177,563)
Balance at end of the period (in shares)	285,711	335,087	346,148
Weighted Average Price
Outstanding exercise price (in usd per share)	$ 90.04	$ 87.54	$ 83.84
Issued (in usd per share)	137.62	97.42	89.82
Granted (in usd per share)	142.37	97.70	81.07
Dividend equivalent (in usd per share)	134.78	95.08	89.65
Forfeited (in usd per share)	114.66	91.79	89.67
Exercised (in usd per share)	87.64	87.69	69.65
Outstanding exercise price (in usd per share)	$ 110.41	$ 90.04	$ 87.54