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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of Restricted and Deferred Stock Activity

A summary of restricted and deferred stock activity follows:

			Number of shares
Non-vested shares outstanding at January 1, 2020			2,102,654
Awarded:
Time-vesting			286,593
Performance-based			166,018
Released:
Time-vesting			(447,469)
Performance-based			(181,705)
Forfeitures:
Time-vesting			(92,681)
Performance-based			(7,651)
Non-vested shares outstanding at December 31, 2020			1,825,759

Summary of Average Grant-Date Fair Value of Restricted Stock

The average grant-date fair value of restricted stock awarded in 2020, 2019 and 2018 follows:

			2020						2019						2018
Time-vested			$	70.07					$	56.06					$	44.48
Performance-based			72.08						46.08						57.24

Schedule of Weighted Average Assumptions on Performance-Based Shares

The fair values of the performance-based awards that include a market condition were calculated using a Monte Carlo valuation model and the following weighted average assumptions:

			2020						2019						2018
Risk-free interest rate			1.6		%				2.5		%				2.0		%
Expected term (years)			3						3						3
Expected stock price volatility			22.0		%				21.4		%				19.9		%

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Schedule of share-based compensation, grant date fair value of restricted stock [table text block]

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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