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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [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, 2018	1,053,842
Awarded:
Time-vesting	1,515,700
Performance-based	150,069
Released:
Time-vesting	(353,555	)
Performance-based	—
Forfeitures:
Time-vesting	(63,575	)
Performance-based	(159,738	)
Non-vested shares outstanding at December 31, 2018	2,142,743

Summary of Average Grant-Date Fair Value of Restricted Stock

The average grant-date fair value of restricted stock awarded in 2018, 2017 and 2016 follows:

	2018				2017				2016
Time-vested	$	44.48			$	55.55			$	51.04
Performance-based	57.24				51.90				51.18

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:

	2018			2017			2016
Risk-free interest rate	2.0	%		1.4	%		1.2	%
Expected term (years)	3			3			3
Expected stock price volatility	19.9	%		21.1	%		19.8	%

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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=109197908&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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