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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Common Stock Shares Reserved for Issuance

​

​	​	​
For outstanding RSUs, PSUs and warrants		1,933,004
For future grants under the 2016 Incentive Award Plan		4,066,471
For future grants under the Employee Share Purchase Plan	​	989,187
​		6,988,662

Restricted Stock Units Activity

A summary of the Company’s RSU activity is presented below:

​

​	​	​	​	​	​	​	​	​	​
​	​	Years Ended December 31,
​		2021			2020			2019
Weighted average grant-date fair value of restricted share units granted	​	$	100.27	​	$	101.79	​	$	81.24
Total fair value of restricted share units vested	​	$	26,711	​	$	23,742	​	$	21,136

Summary of Warrant Activity

A summary of warrant activity during the year ended December 31, 2021, is presented below:

​

​	​	​	​	​	​
​		​		Weighted-Average
​	​	Warrants	​	Exercise Price
Outstanding at December 31, 2020		489,748	​	$	86.41
Granted		218,166	​	$	110.91
Forfeited		(82,779)	​	$	81.35
Exercised		(46,730)	​	$	72.88
Outstanding at December 31, 2021		578,405	​	$	104.82

Summarized Information about Warrants Outstanding

The following table summarizes information about warrants outstanding as of December 31, 2021 and 2020:

​

​	​	​	​	​	​	​	​	​	​	​	​
​		​		​		Fair Value of		​	​	​	​
​	​	Warrants	​	​	​	Warrants		​	Outstanding at December 31,
Grant Date	​	Issued	​	Exercise Price	​	Issued		​	2021	​	2020
Throughout 2016		15,666	​	$42.22 to $51.55	​	$	189		—		7,158
Throughout 2017		35,382	​	$53.65 to $69.96	​	$	595		1,521		33,551
Throughout 2018		163,995	​	$70.91 to $80.90	​	$	2,591		112,756		133,141
Throughout 2019	​	151,008	​	$74.25 to $95.61	​	$	2,634	​	101,977	​	151,008
Throughout 2020	​	164,890	​	$72.65 to $104.89	​	$	3,140	​	146,386	​	164,890
Throughout 2021	​	218,166	​	$99.33 to $135.97	​	$	5,584	​	215,765	​	—
​	​	​	​	​	​	​			578,405		489,748

Restricted Stock Units (RSUs) [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Activity Related to Restricted Stock Units

A summary of activity related to RSUs during the year ended December 31, 2021, is presented below:

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	​	​	Grant Date Fair
​		Unvested Shares	​	Value Per Share
Outstanding at December 31, 2020		772,625	​	$	84.61
Granted		498,078	​	$	100.27
Forfeited		(65,528)	​	$	94.63
Vested and issued		(343,480)	​	$	77.76
Outstanding at December 31, 2021		861,695	​	$	95.63

Performance Shares [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Performance-Based Restricted Share Units Activity

A summary of the Company’s PSU activity is presented below:

​

​	​	​	​	​	​	​	​	​	​
​	​	Years Ended December 31,
​		2021			2020			2019
Weighted average grant-date fair value of PSUs granted	​	$	96.99	​	$	87.19	​	$	80.85
Total fair value of PSUs vested	​	$	10,954	​	$	15,628	​	$	7,683

Summary of Performance-Based Restricted Stock Units Activity and Related Information

A summary of activity related to PSUs during the year ended December 31, 2021, is presented below:

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	​	​	Grant Date Fair
​		Unvested Shares	​	Value Per Share
Outstanding at December 31, 2020		434,558	​	$	82.60
Granted		116,784	​	$	96.99
Forfeited		(5,048)	​	$	68.58
Vested and issued		(154,251)	​	$	71.01
Outstanding at December 31, 2021		392,043	​	$	91.63

Deferred Share Units [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Restricted Stock Units Activity

A summary of the Company’s deferred share units (“DSUs”) activity is presented below:

​

​	​	​	​	​	​	​	​	​	​
​	​	Years Ended December 31,
​		2021		​	2020			2019
Weighted average grant-date fair value of DSUs granted	​	$	99.80	​	$	103.81	​	$	83.80
Total fair value of DSUs awarded	​	$	285	​	$	272	​	$	319

Summary of Activity Related to Restricted Stock Units

A summary of activity related to DSUs during the year ended December 31, 2021, is presented below:

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	​	​	Grant Date Fair
​		Vested Shares	​	Value Per Share
Outstanding at December 31, 2020		21,586	​	$	59.32
Granted		2,856	​	$	99.80
Outstanding at December 31, 2021		24,442	​	$	64.05

Progressive Waste Solutions Ltd. [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Stock Option Activity and Related Information

​

​	​	​
Outstanding at December 31, 2020		51,200
Cash settled		(5,331)
Outstanding at December 31, 2021		45,869

Progressive Waste Solutions Ltd. [Member] | Restricted Stock Units (RSUs) [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Activity Related to Restricted Stock Units

​

​	​	​
Outstanding at December 31, 2020		66,554
Cash settled		(3,522)
Outstanding at December 31, 2021		63,032

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