Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The following disclosure regarding certain of our significant accounting policies should be read in conjunction with Note 2 to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2017, which may provide additional information with regard to the accounting policies set forth herein and other of our significant accounting policies. Revenue Recognition Revenues for the Company include rent, storage and warehouse services (collectively, Warehouse Revenue), third-party managed services for locations or logistics services managed on behalf of customers (Third-Party Managed Revenue), transportation services (Transportation Revenue), and revenue from the sale of quarry products (Other Revenue). Warehouse Revenue The Company’s customer arrangements generally include rent, storage and service elements that are priced separately. In a few instances where the Company provides rental, storage and warehouse services under the terms of a bundled pricing structure, the Company uses a cost model to allocate the consideration related to the rental of temperature-controlled storage space and warehousing service deliverables. Revenues from storage and handling are recognized over the period consistent with the transfer of the service to the customer. Multiple contracts with a single counterparty are accounted for as separate arrangements. Third-Party Managed Revenue The Company provides management services for which the contract compensation arrangement includes: reimbursement of operating costs, fixed management fee, and contingent performance-based fees (Managed Services). Managed Services fixed fees are recognized as revenue as the management services are performed ratably over the service period. Managed Services performance-based fees are recognized ratably over the service period based on the likelihood of achieving performance targets. Cost reimbursements related to Managed Services arrangements are recognized as revenue as the services are performed and costs are incurred. Managed Services fees and related cost reimbursements are presented on a gross basis as the Company is the principal in the arrangement. Multiple contracts with a single counterparty are accounted for as separate arrangements. Transportation Revenue The Company records transportation revenue and expenses upon delivery of the product. Since the Company is the principal in the arrangement of transportation services for its customers, revenues and expenses are presented on a gross basis. Other Revenue Other Revenue primarily includes the sale of limestone produced by the Company’s quarry business. Revenues from the sale of limestone are recognized upon delivery to customers. Contracts with Multiple Service Lines When considering contracts containing more than one service to a customer, a contract's transaction price is pre-defined or allocated to each distinct performance obligation and recognized as revenue when, or as the performance obligation is satisfied, either over time as work progresses, or at a point in time. For contracts with multiple service lines or distinct performance obligations, the Company evaluates and allocates the contract’s transaction price to each performance obligation using our best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate standalone selling price is the expected cost plus a margin approach, under which the Company forecasts expected costs of satisfying a performance obligation and then adds an appropriate margin for that distinct good or service. Recently Adopted Accounting Standards Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In February 2018, the Financial Accounting Standards Board (FASB) issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (AOCI). The ASU permits entities to reclassify tax effects stranded in AOCI as a result of tax reform to retained earnings. The guidance is effective for the Company in interim and annual periods beginning in 2019. Early adoption is permitted and can be applied retrospectively or in the period of adoption. The Company early adopted the ASU during the first quarter of 2018. Because the deferred tax asset in OCI is currently subject to a full valuation allowance, there is no net reclassification amount from AOCI to retained earnings during the quarter. However, our adoption of the principle will enable us to apply a 21% rate to the deferred tax asset when the valuation allowance no longer applies. Compensation—Stock Compensation In May 2017, the Financial Accounting Standard Board (FASB) issued Accounting Standard Update (ASU) 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting. This update provides guidance on determining which changes to the terms and conditions of share-based payment awards require an entity to apply modification accounting under Topic 718. ASU 2017-09 was effective for all entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2017. The Company adopted ASU 2017-09 in the first quarter of 2018 and it did not have a material effect on its condensed consolidated financial statements. Compensation - Retirement Benefits In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). This update requires that the service cost component of net periodic pension and other postretirement benefits (OPEB) (income) expense be presented in the same income statement line item as other employee compensation costs, while the remaining components of net periodic pension and OPEB (income) expense are to be presented outside operating income. Retrospective application of the change in income statement presentation is required, while the change in capitalized benefit cost is to be applied prospectively. ASU 2017-01 was effective for public business entities for fiscal years beginning after December 15, 2017. The Company's adoption of this guidance resulted in the reclassification of non-service cost components of $0.3 million and $0.9 million from "Selling, general and administrative" expense to "Other income, net" for the three months ended March 31, 2018 and March 31, 2017, respectively, in the condensed consolidated statements of operations. Statement of Cash Flows, Restricted Cash In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. Under this new guidance, entities will be required to show the changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash and restricted cash equivalents in the statement of cash flows. When cash, cash equivalents, restricted cash and restricted cash equivalents are presented in more than one line item on the balance sheet, a reconciliation of the totals in the statement of cash flows to the related captions in the balance sheet is required. For public business entities, the guidance was effective for fiscal years beginning after December 15, 2017, and interim periods within those years. The Company adopted ASU 2016-18 in the first quarter of 2018 and disclosure revisions have been made retrospectively for the periods presented on the condensed consolidated statements of cash flows. Statement of Cash Flows, Classification of Certain Cash Receipts and Cash Payments In August 2016, the FASB issued Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) (ASU 2016-15), which clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows. The guidance also clarifies how the predominance principle should be applied when cash receipts and cash payments have aspects of more than one class of cash flows. This new guidance was effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those years. Entities will have to apply the guidance retrospectively, but if it is impracticable to do so for an issue, the amendments related to that issue would be applied prospectively. The Company adopted ASU 2016-15 in the first quarter of 2018 and it did not have a material effect on its condensed consolidated statements of cash flows. Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The update primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. For public companies, the amendments in this update were effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-01 in the first quarter of 2018 and it did not have a material effect on its condensed consolidated financial statements. Revenue Recognition In May 2014, the FASB issued ASU 2014-09 (Topic 606), Revenue from Contracts with Customers, to clarify the principles used to recognize revenue for all entities. ASU 2014-09 provides new guidance related to the core principle that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new guidance results in enhanced disclosures about revenue, provides guidance for transactions that were not previously addressed comprehensively, and improves guidance for multiple element arrangements. During 2016, the FASB issued additional ASUs to clarify certain aspects of ASU 2014-09, including ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), in March 2016, and ASU 2016-10, Identifying Performance Obligations and Licensing, in April 2016. The Company adopted this standard effective January 1, 2018, applying the modified retrospective method, and determined that the standard did not have a material impact to the amount or timing of revenue recognized for its revenue arrangements. Additionally, the Company did not record any cumulative effect adjustment as of the date of adoption. The most significant impact of the standard relates to the addition of disclosures relating to contracts that contain performance obligations extending beyond the end of the reporting period, and quantifying and disclosing methods of transferring services as it pertains to satisfying performance obligations. See Note 18. Adoption of the standards related to revenue recognition had no impact to cash from or used in operating, financing, or investing activities on the condensed consolidated statements of cash flows, and had no material impact on the Company's processes and controls. Future Adoption of Accounting Standards Lease Accounting In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The following are some of the key provisions of this update: Lessees will need to recognize a right-of-use asset and a lease liability for virtually all of their leases (other than leases that meet the definition of a short-term lease). The liability will be equal to the present value of lease payments. The asset will be based on the liability, subject to adjustment, such as for initial direct costs. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) while finance leases will result in a front-loaded expense pattern (similar to current capital leases). Classification will be based on criteria that are largely similar to those applied in current lease accounting, but without explicit bright lines. Lessor accounting is similar to the current model, but updated to align with certain changes to the lessee model (e.g., certain definitions, such as initial direct costs, have been updated) and the new revenue recognition standard. Similar to today, lessors will classify leases as operating, direct financing, or sales-type. Existing sale-leaseback guidance, including guidance applicable to real estate, is replaced with a new model applicable to both lessees and lessors. A sale-leaseback transaction will qualify as a sale only if (1) it meets the sale guidance in the new revenue recognition standard, (2) the leaseback is not a finance lease or a sales-type lease, and (3) a repurchase option, if any, is priced at the asset’s fair value at the time of exercise and the asset is not specialized. If the transaction fails sale treatment, the buyer and seller will reflect it as a financing. For public business entities, the standard is effective for fiscal years and interim periods beginning after December 15, 2018. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. The Company is currently evaluating the potential impact of adopting ASU 2016-02.

Summary of Significant Accounting Policies

The following disclosure regarding certain of our significant accounting policies should be read in conjunction with Note 2 to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2017, which may provide additional information with regard to the accounting policies set forth herein and other of our significant accounting policies.

Revenue Recognition

Revenues for the Company include rent, storage and warehouse services (collectively, Warehouse Revenue), third-party managed services for locations or logistics services managed on behalf of customers (Third-Party Managed Revenue), transportation services (Transportation Revenue), and revenue from the sale of quarry products (Other Revenue).

Warehouse Revenue

The Company’s customer arrangements generally include rent, storage and service elements that are priced separately. In a few instances where the Company provides rental, storage and warehouse services under the terms of a bundled pricing structure, the Company uses a cost model to allocate the consideration related to the rental of temperature-controlled storage space and warehousing service deliverables.

Revenues from storage and handling are recognized over the period consistent with the transfer of the service to the customer. Multiple contracts with a single counterparty are accounted for as separate arrangements.

Third-Party Managed Revenue

The Company provides management services for which the contract compensation arrangement includes: reimbursement of operating costs, fixed management fee, and contingent performance-based fees (Managed Services). Managed Services fixed fees are recognized as revenue as the management services are performed ratably over the service period. Managed Services performance-based fees are recognized ratably over the service period based on the likelihood of achieving performance targets.

Cost reimbursements related to Managed Services arrangements are recognized as revenue as the services are performed and costs are incurred. Managed Services fees and related cost reimbursements are presented on a gross basis as the Company is the principal in the arrangement. Multiple contracts with a single counterparty are accounted for as separate arrangements.

Transportation Revenue

The Company records transportation revenue and expenses upon delivery of the product. Since the Company is the principal in the arrangement of transportation services for its customers, revenues and expenses are presented on a gross basis.

Other Revenue

Other Revenue primarily includes the sale of limestone produced by the Company’s quarry business. Revenues from the sale of limestone are recognized upon delivery to customers.

Contracts with Multiple Service Lines

When considering contracts containing more than one service to a customer, a contract's transaction price is pre-defined or allocated to each distinct performance obligation and recognized as revenue when, or as the performance obligation is satisfied, either over time as work progresses, or at a point in time. For contracts with multiple service lines or distinct performance obligations, the Company evaluates and allocates the contract’s transaction price to each performance obligation using our best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate standalone selling price is the expected cost plus a margin approach, under which the Company forecasts expected costs of satisfying a performance obligation and then adds an appropriate margin for that distinct good or service.

Recently Adopted Accounting Standards

Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

In February 2018, the Financial Accounting Standards Board (FASB) issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (AOCI). The ASU permits entities to reclassify tax effects stranded in AOCI as a result of tax reform to retained earnings. The guidance is effective for the Company in interim and annual periods beginning in 2019. Early adoption is permitted and can be applied retrospectively or in the period of adoption. The Company early adopted the ASU during the first quarter of 2018. Because the deferred tax asset in OCI is currently subject to a full valuation allowance, there is no net reclassification amount from AOCI to retained earnings during the quarter. However, our adoption of the principle will enable us to apply a 21% rate to the deferred tax asset when the valuation allowance no longer applies.

Compensation—Stock Compensation

In May 2017, the Financial Accounting Standard Board (FASB) issued Accounting Standard Update (ASU) 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting. This update provides guidance on determining which changes to the terms and conditions of share-based payment awards require an entity to apply modification accounting under Topic 718. ASU 2017-09 was effective for all entities for annual periods, including interim periods within those annual periods, beginning after December 15, 2017. The Company adopted ASU 2017-09 in the first quarter of 2018 and it did not have a material effect on its condensed consolidated financial statements.

Compensation - Retirement Benefits

In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07). This update requires that the service cost component of net periodic pension and other postretirement benefits (OPEB) (income) expense be presented in the same income statement line item as other employee compensation costs, while the remaining components of net periodic pension and OPEB (income) expense are to be presented outside operating income. Retrospective application of the change in income statement presentation is required, while the change in capitalized benefit cost is to be applied prospectively. ASU 2017-01 was effective for public business entities for fiscal years beginning after December 15, 2017. The Company's adoption of this guidance resulted in the reclassification of non-service cost components of $0.3 million and $0.9 million from "Selling, general and administrative" expense to "Other income, net" for the three months ended March 31, 2018 and March 31, 2017, respectively, in the condensed consolidated statements of operations.

Statement of Cash Flows, Restricted Cash

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. Under this new guidance, entities will be required to show the changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash and restricted cash equivalents in the statement of cash flows. When cash, cash equivalents, restricted cash and restricted cash equivalents are presented in more than one line item on the balance sheet, a reconciliation of the totals in the statement of cash flows to the related captions in the balance sheet is required. For public business entities, the guidance was effective for fiscal years beginning after December 15, 2017, and interim periods within those years. The Company adopted ASU 2016-18 in the first quarter of 2018 and disclosure revisions have been made retrospectively for the periods presented on the condensed consolidated statements of cash flows.

Statement of Cash Flows, Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) (ASU 2016-15), which clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows. The guidance also clarifies how the predominance principle should be applied when cash receipts and cash payments have aspects of more than one class of cash flows. This new guidance was effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those years. Entities will have to apply the guidance retrospectively, but if it is impracticable to do so for an issue, the amendments related to that issue would be applied prospectively. The Company adopted ASU 2016-15 in the first quarter of 2018 and it did not have a material effect on its condensed consolidated statements of cash flows.

Recognition and Measurement of Financial Assets and Financial Liabilities

In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The update primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. For public companies, the amendments in this update were effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-01 in the first quarter of 2018 and it did not have a material effect on its condensed consolidated financial statements.

Revenue Recognition

In May 2014, the FASB issued ASU 2014-09 (Topic 606), Revenue from Contracts with Customers, to clarify the principles used to recognize revenue for all entities. ASU 2014-09 provides new guidance related to the core principle that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new guidance results in enhanced disclosures about revenue, provides guidance for transactions that were not previously addressed comprehensively, and improves guidance for multiple element arrangements. During 2016, the FASB issued additional ASUs to clarify certain aspects of ASU 2014-09, including ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), in March 2016, and ASU 2016-10, Identifying Performance Obligations and Licensing, in April 2016.

The Company adopted this standard effective January 1, 2018, applying the modified retrospective method, and determined that the standard did not have a material impact to the amount or timing of revenue recognized for its revenue arrangements. Additionally, the Company did not record any cumulative effect adjustment as of the date of adoption. The most significant impact of the standard relates to the addition of disclosures relating to contracts that contain performance obligations extending beyond the end of the reporting period, and quantifying and disclosing methods of transferring services as it pertains to satisfying performance obligations. See Note 18.

Adoption of the standards related to revenue recognition had no impact to cash from or used in operating, financing, or investing activities on the condensed consolidated statements of cash flows, and had no material impact on the Company's processes and controls.

Future Adoption of Accounting Standards

Lease Accounting

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The following are some of the key provisions of this update:

Lessees will need to recognize a right-of-use asset and a lease liability for virtually all of their leases (other than leases that meet the definition of a short-term lease). The liability will be equal to the present value of lease payments. The asset will be based on the liability, subject to adjustment, such as for initial direct costs. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) while finance leases will result in a front-loaded expense pattern (similar to current capital leases). Classification will be based on criteria that are largely similar to those applied in current lease accounting, but without explicit bright lines. Lessor accounting is similar to the current model, but updated to align with certain changes to the lessee model (e.g., certain definitions, such as initial direct costs, have been updated) and the new revenue recognition standard. Similar to today, lessors will classify leases as operating, direct financing, or sales-type.

Existing sale-leaseback guidance, including guidance applicable to real estate, is replaced with a new model applicable to both lessees and lessors. A sale-leaseback transaction will qualify as a sale only if (1) it meets the sale guidance in the new revenue recognition standard, (2) the leaseback is not a finance lease or a sales-type lease, and (3) a repurchase option, if any, is priced at the asset’s fair value at the time of exercise and the asset is not specialized. If the transaction fails sale treatment, the buyer and seller will reflect it as a financing.

For public business entities, the standard is effective for fiscal years and interim periods beginning after December 15, 2018. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. The Company is currently evaluating the potential impact of adopting ASU 2016-02.