Revenue Revenue	3 Months Ended
Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Adoption of ASC Topic 606, “Revenue from Contracts with Customers” In the first quarter of 2018, we adopted Topic 606 using the modified retrospective method with respect to applicable contracts existing as of January 1, 2018. As provided in the guidance, we recognize marine operating revenue in the amount that corresponds directly to the value transferred to the customer. Contract assets and liabilities related to our customer performance obligations are not material to our financial statements. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts have not been adjusted and continue to be reported in accordance with appropriate accounting guidance. We recorded an immaterial cumulative adjustment to opening retained earnings, with the impact completely attributable to our marine operating revenue. Revenue Recognition Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. We disaggregate revenue into three categories as presented on our income statement: Lease Revenue Lease revenue, which includes operating lease revenue and finance lease revenue, is our primary source of revenue which continues to be within the scope of existing lease guidance. Therefore, the adoption of ASC 606 had no impact on our recognition or presentation of lease revenue. Operating Lease Revenue We lease railcars and other operating assets under full-service and net operating leases. We price full-service leases as an integrated service that includes amounts related to executory costs, such as maintenance, insurance, and ad valorem taxes. We do not offer stand-alone maintenance service contracts and are unable to separate executory costs from full-service lease revenue. Operating lease revenue, including amounts related to executory costs, is recognized on a straight-line basis over the term of the underlying lease. As a result, we may not recognize lease revenue in the same period as maintenance and other executory costs, which we expense as incurred. Contingent rents are recognized when the contingency is resolved. Revenue is not recognized if collectability is not reasonably assured. Finance Lease Revenue In certain cases, we lease railcars and other operating assets that, at lease inception, are classified as finance leases. We recognize unearned income as lease revenue using the interest method, which produces a constant yield over the lease term. Initial unearned income is the amount that the original lease payment receivable and the estimated residual value of the leased asset exceeds the original cost or carrying value of the leased asset. Marine Operating Revenue We generate marine operating revenue through shipping services completed by our marine vessels. Upon adoption of ASC 606, marine operating revenue is recognized over time as the performance obligation is satisfied, beginning when cargo is loaded through its delivery and discharge. Revenue is recognized pro rata over the projected duration of each voyage, which is derived from our historical voyage data. Other Revenue Other revenue is comprised of customer liability repair revenue, utilization income, fee income, interest on loans, and other miscellaneous revenues. Select components of other revenue are within the scope of Topic 606 but based on our assessment, we determined that our current revenue elements and timing for purposes of income recognition are consistent with applicable provisions in the new standard. The remaining items are considered lease components that continue to be within the scope of existing lease guidance.

Revenue

Adoption of ASC Topic 606, “Revenue from Contracts with Customers”

In the first quarter of 2018, we adopted Topic 606 using the modified retrospective method with respect to applicable contracts existing as of January 1, 2018. As provided in the guidance, we recognize marine operating revenue in the amount that corresponds directly to the value transferred to the customer. Contract assets and liabilities related to our customer performance obligations are not material to our financial statements. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts have not been adjusted and continue to be reported in accordance with appropriate accounting guidance. We recorded an immaterial cumulative adjustment to opening retained earnings, with the impact completely attributable to our marine operating revenue.

Revenue Recognition

Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services.

We disaggregate revenue into three categories as presented on our income statement:

Lease Revenue

Lease revenue, which includes operating lease revenue and finance lease revenue, is our primary source of revenue which continues to be within the scope of existing lease guidance. Therefore, the adoption of ASC 606 had no impact on our recognition or presentation of lease revenue.

Operating Lease Revenue

We lease railcars and other operating assets under full-service and net operating leases. We price full-service leases as an integrated service that includes amounts related to executory costs, such as maintenance, insurance, and ad valorem taxes. We do not offer stand-alone maintenance service contracts and are unable to separate executory costs from full-service lease revenue. Operating lease revenue, including amounts related to executory costs, is recognized on a straight-line basis over the term of the underlying lease. As a result, we may not recognize lease revenue in the same period as maintenance and other executory costs, which we expense as incurred. Contingent rents are recognized when the contingency is resolved. Revenue is not recognized if collectability is not reasonably assured.

Finance Lease Revenue

In certain cases, we lease railcars and other operating assets that, at lease inception, are classified as finance leases. We recognize unearned income as lease revenue using the interest method, which produces a constant yield over the lease term. Initial unearned income is the amount that the original lease payment receivable and the estimated residual value of the leased asset exceeds the original cost or carrying value of the leased asset.

Marine Operating Revenue

We generate marine operating revenue through shipping services completed by our marine vessels. Upon adoption of ASC 606, marine operating revenue is recognized over time as the performance obligation is satisfied, beginning when cargo is loaded through its delivery and discharge. Revenue is recognized pro rata over the projected duration of each voyage, which is derived from our historical voyage data.

Other Revenue

Other revenue is comprised of customer liability repair revenue, utilization income, fee income, interest on loans, and other miscellaneous revenues. Select components of other revenue are within the scope of Topic 606 but based on our assessment, we determined that our current revenue elements and timing for purposes of income recognition are consistent with applicable provisions in the new standard. The remaining items are considered lease components that continue to be within the scope of existing lease guidance.