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Incentive Award Plan (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of summary of restricted stock units
A summary of ACC’s RSUs under the Plan for the years ended December 31, 2019 and 2018 and activity during the years then ended is presented below: 
 
 
Number of
RSUs
 
Weighted-Average Grant Date Fair Value Per RSU
Outstanding at December 31, 2017
 
—

 
$
—

Granted
 
27,376

 
39.45

Settled in common shares
 
(27,376
)
 
39.45

Outstanding at December 31, 2018
 
—

 
—

Granted
 
20,812

 
47.34

Settled in common shares
 
(18,318
)
 
47.37

Settled in cash
 
(2,494
)
 
47.11

Outstanding at December 31, 2019
 
—

 
—
Schedule of summary of restricted stock awards A summary of the Company’s RSAs under the Plan for the years ended December 31, 2019 and 2018 is presented below: 
 
 
Number of
RSAs
 
Weighted-Average
Grant Date Fair Value
Per RSA
Nonvested balance at December 31, 2017
 
810,870

 
$
44.16

Granted
 
357,387

 
39.41

Vested
 
(249,102
)
 
43.36

Forfeited
 
(56,475
)
 
43.64

Nonvested balance at December 31, 2018
 
862,680

 
$
42.46

Granted
 
387,341

 
44.08

Vested
 
(266,556
)
 
41.86

Forfeited
 
(16,124
)
 
42.91

Nonvested balance at December 31, 2019
 
967,341

 
$
43.27