All of the Company’s leases are classified as operating leases. The Company's Lease income is comprised of both fixed and variable income. Fixed and in-substance fixed lease income includes stated amounts per the lease contract, which are primarily related to base rent, and in some cases stated amounts for common area maintenance (“CAM”), real estate taxes, and insurance (“Recoverable Costs”). Income for these amounts is recognized on a straight-line basis.

Variable lease income includes the following two main items in the lease contracts:

(i) Recoveries from tenants represents the tenants’ contractual obligations to reimburse the Company for their portion of Recoverable Costs incurred. Generally the Company’s leases provide for the tenants to reimburse the Company based on the tenants’ share of the actual costs incurred in proportion to the tenants’ share of leased space in the property.

(ii) Percentage rent represents amounts billable to tenants based on the tenants’ actual sales volume in excess of levels specified in the lease contract.

The following table provides a disaggregation of lease income recognized as either fixed or variable lease income based on the criteria specified in ASC Topic 842:


(in thousands)	Three months ended March 31,
	2022		2021
Operating lease income
Fixed and in-substance fixed lease income	$	207,502		196,054
Variable lease income		72,026		64,067
Other lease related income, net:
Above/below market rent and tenant rent inducement amortization, net		5,689		5,996
Uncollectible straight-line rent		2,282		(2,035	)
Uncollectible amounts billable in lease income		6,146		2,275
Total lease income	$	293,645		266,357

Lease income for operating leases with fixed payment terms is recognized on a straight-line basis over the expected term of the lease for all leases in which collectibility is considered probable. At lease commencement, the Company generally expects that collectibility of substantially all payments due under the lease is probable due to the Company’s credit checks on tenants and other credit analysis undertaken before entering into a new lease; therefore, income from most operating leases is initially recognized on a straight-line basis. For operating leases in which collectibility of Lease income is not considered probable, Lease income is recognized on a cash basis and all previously recognized straight-line rent receivables are reversed in the period in which the Lease income is determined no longer to be probable of collection. Should collectibility of Lease income become probable again, through evaluation of qualitative and quantitative measures on a tenant by tenant basis, accrual basis accounting resumes and all commencement-to-date straight-line rent is recognized in that period. In addition to the lease-specific collectibility assessment performed under Topic 842, the Company may also recognize a general reserve, as a reduction to Lease income, for its portfolio of operating lease receivables which are not expected to be fully collectible based on the Company’s historical collection experience.

The following table represents the components of Tenant and other receivables in the accompanying Consolidated Balance Sheets:


(in thousands)	March 31, 2022		December 31, 2021
Tenant receivables	$	17,756	$	27,354
Straight-line rent receivables		109,953		103,942
Other receivables (1)		24,143		21,795
Total tenant and other receivables	$	151,852	$	153,091

(1)

Other receivables include construction receivables, insurance receivables, and amounts due from real estate partnerships for Management, transaction and other fee income.