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Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Schedule of Estimated Useful Lives of Property and Equipment
Property and equipment are generally depreciated over the following estimated useful lives on a straight-line basis:

Buildings and improvements
15 to 40 years
Land improvements
10 to 20 years
Furniture and fixtures
3 to 20 years
Equipment
3 to 15 years
Schedule of Contract and Contract - Related Liabilities
The following table summarizes the activity related to contract and contract-related liabilities:

 Outstanding Chip Liability Loyalty ProgramCustomer Advances and Other
 2021 20202021202020212020
 (in thousands)
Balance at January 1$212,671 $314,570 $139,756 $126,966 $382,287 $481,095 
Balance at December 31176,219 212,671 144,465 139,756 640,001 382,287 
Increase / (decrease)$(36,452)$(101,899)$4,709 $12,790 $257,714 $(98,808)
Schedule of Diluted Weighted-Average Number of Common and Common Equivalent Shares Adjustments for Potential Dilution of Share-Based Awards Outstanding Diluted weighted average common and common equivalent shares include adjustments for potential dilution of share-based awards outstanding under the Company’s stock compensation plan.
 
Year Ended December 31,
 202120202019
Numerator:(In thousands)
Net income (loss) attributable to MGM Resorts International$1,254,370 $(1,032,724)$2,049,146 
Adjustment related to redeemable noncontrolling interests(78,298)35,520 (2,713)
Net income (loss) available to common stockholders - basic1,176,072 (997,204)2,046,433 
Other— — (194)
Net income (loss) attributable to common stockholders - diluted$1,176,072 $(997,204)$2,046,239 
Denominator:
Weighted average common shares outstanding basic481,930 494,152 524,173 
Potential dilution from share-based awards5,426 — 3,472 
Weighted average common and common equivalent shares - diluted487,356 494,152 527,645 
Antidilutive share-based awards excluded from the calculation of diluted earnings per share198 9,493 1,617