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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019	2,142,743
Awarded:
Time-vesting	406,145
Performance-based	202,876
Released:
Time-vesting	(387,628	)
Performance-based	—
Forfeitures:
Time-vesting	(132,275	)
Performance-based	(129,207	)
Non-vested shares outstanding at December 31, 2019	2,102,654

Summary of Average Grant-Date Fair Value of Restricted Stock

The average grant-date fair value of restricted stock awarded in 2019, 2018 and 2017 follows:

	2019				2018				2017
Time-vested	$	56.06			$	44.48			$	55.55
Performance-based	46.08				57.24				51.90

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:

	2019			2018			2017
Risk-free interest rate	2.5	%		2.0	%		1.4	%
Expected term (years)	3			3			3
Expected stock price volatility	21.4	%		19.9	%		21.1	%

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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=116856206&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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