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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-Based Compensation [Abstract]

Schedule of the Allocation of Performance Shares Between Total Shareholder Return, Earnings per Share, and Return on Invested Capital

​

​	​	​	​	​	​	​	​
​		2020		2019		2018	​
Total shareholder return	​	45	%	45	%	55	%
Earnings per share	​	36	%	36	%	45	%
Return on invested capital	​	18	%	18	%	-	%

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

​

​	​	​	​	​	​	​	​	​	​	​
​	​	Time-based awards				​	Performance-based awards
​	​	​	​	Weighted-		​	​	​	Weighted-
​	​	​	​	average grant		​	Performance	​	average grant
​		Share Units		date fair value			Shares		date fair value
Non-vested as of December 31, 2019	​	361,834	​	$	25.84	​	566,336	​	$	28.97
Granted	​	306,161	​	$	17.78	​	409,686	​	$	17.10
Vested	​	(128,144)	​	$	22.13	​	(145,569)	​	$	22.08
Forfeited or cancelled	​	(37,123)	​	$	25.37	​	(77,670)	​	$	24.37
Non-vested as of December 31, 2020	​	502,728	​	$	21.89	​	752,783	​	$	24.32

​

​	​	​	​	​	​	​	​	​	​	​
​	​	Time-based awards				​	Performance-based awards
​	​	​	​	Weighted-		​	​	​	​	Weighted-
​	​	​	​	average grant		​	Performance	​	average grant
​		Share Units		date fair value			Shares		date fair value
Non-vested as of December 31, 2018	​	419,996	​	$	19.64	​	628,220	​	$	21.41
Granted	​	184,645	​	$	30.01	​	250,858	​	$	34.17
Vested	​	(196,404)	​	$	17.08	​	(236,902)	​	$	14.92
Forfeited or cancelled	​	(46,403)	​	$	23.70	​	(75,840)	​	$	27.42
Non-vested as of December 31, 2019	​	361,834	​	$	25.84	​	566,336	​	$	28.97
​	​	​	​	​	​	​	​	​	​	​

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- Definition

Schedule of the Allocation of Performance Shares Between Total Shareholder Return, Earnings per Share, and Return on Invested Capital [Table Text Block]

+ References

No definition available.

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- Definition

Tabular disclosure of share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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

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