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Stock Incentive Compensation and Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Payment Award, Performance Shares, Valuation Assumptions

The following are the weighted average-assumptions used to estimate the fair value for all performance share awards issued in each respective year.

Performance Share Awards

Year ended December 31,

2020

2019

2018

Expected volatility (1)

n/a

n/a

15.8%

Expected term (in years)

n/a

n/a

n/a

Expected dividend yield

n/a

n/a

n/a

Risk-free interest rate (1)

n/a

n/a

1.85% - 2.36%

(1)The expected volatility and risk-free interest rate applied are specific to each tranche of performance share awards.

Schedule of Share-based Compensation, Cash Settled Restricted Stock Units and Performance Shares

Cash Settled Restricted Stock Units

						Number of Shares
			Nonvested at December 31, 2017			262,330
			Awards granted			—
			Awards vested			(108,344)
			Awards forfeited			(7,069)
			Nonvested at December 31, 2018			146,917
			Awards granted			—
			Awards vested			(80,012)
			Awards forfeited			(3,161)
			Nonvested at December 31, 2019			63,744
			Awards granted			—
			Awards vested			(44,734)
			Awards forfeited			(529)
			Nonvested at December 31, 2020			18,481

Performance Share Awards

						Number of Shares (1)						Weighted Average  Grant Date Fair Value
			Nonvested at December 31, 2017			167,673						$	53.11
			Awards granted			83,475						60.69
			Awards vested			(16,456)						53.79
			Awards forfeited			(82,241)						—
			Nonvested at December 31, 2018			152,451						$	57.21
			Awards granted			58,050						146.10
			Awards vested			(21,730)						49.90
			Awards forfeited			(43,924)						—
			Nonvested at December 31, 2019			144,847						$	94.70
			Awards granted			65,840						170.40
			Awards vested			(48,997)						61.48
			Awards forfeited			(9,976)						—
			Nonvested at December 31, 2020			151,714						$	140.96

(1)     For performance share awards, the number of shares is stated at the maximum number that can be attained if the performance conditions are fully met. Forfeitures represent shares forfeited due to vesting below the maximum attainable as a result of the Company not fully meeting the performance conditions.

Schedule of Share-based Compensation, Restricted Stock Awards

Restricted Stock Awards

						Employee Restricted Stock Awards												Non-Employee Director Restricted Stock Awards												Total Restricted Stock Awards
						Number of Shares						Weighted Average Grant Date Fair  Value						Number of Shares						Weighted Average Grant Date Fair  Value						Number of Shares						Weighted Average Grant Date Fair  Value
			Nonvested at December 31, 2017			333,037						$	120.93					20,126						$	131.09					353,163						$	121.51
			Awards granted			255,799						132.70						12,169						127.29						267,968						132.79
			Awards vested			(139,454)						112.70						(9,761)						123.59						(149,215)						113.41
			Awards forfeited			(1,642)						134.38						—						—						(1,642)						134.38
			Nonvested at December 31, 2018			447,740						$	130.37					22,534						$	132.29					470,274						$	130.46
			Awards granted			242,832						146.92						11,444						147.43						254,276						146.94
			Awards vested			(165,245)						124.71						(12,972)						131.88						(178,217)						125.23
			Awards forfeited			(14,467)						136.16						—						—						(14,467)						136.16
			Nonvested at December 31, 2019			510,860						$	139.91					21,006						$	140.79					531,866						$	139.94
			Awards granted			309,892						145.03						9,970						170.40						319,862						145.82
			Awards vested			(213,488)						138.35						(10,316)						141.12						(223,804)						138.47
			Awards forfeited			(14,517)						140.11						—						—						(14,517)						140.11
			Nonvested at December 31, 2020			592,747						$	143.14					20,660						$	155.03					613,407						$	143.54

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance share, including, but not limited to: (a) expected term of performance shares and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, and (d) risk-free rate(s).

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

+ References

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 (c)(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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