Recent accounting pronouncements	9 Months Ended
Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Description of New Accounting Pronouncements Not yet Adopted	Recent Accounting Pronouncements In May 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2017-09, Compensation—Stock Compensation (Topic 718) – Scope of Modification Accounting. The amendments included in this update provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The amendments in this update will be applied prospectively to an award modified on or after the adoption date. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. The Company is currently evaluating the impact of this guidance on our consolidated financial position, results of operations, comprehensive income, cash flows and disclosures. In November 2016, the FASB issued ASU No. 2016-18, Restricted Cash, which amends Accounting Standards Codification (ASC) Topic 230, Statement of Cash Flows. This ASU requires that the statement of cash flows explain the change during the period in total cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. This ASU is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on our consolidated financial position, results of operations, comprehensive income, cash flows and disclosures. In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments, which amends ASC Topic 230, Statement of Cash Flows. This ASU seeks to reduce the diversity currently in practice by providing guidance on the presentation of eight specific cash flow issues in the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is currently evaluating the impact of this guidance on our consolidated statement of cash flows. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which amends ASC Topic 718, Compensation - Stock Compensation. This ASU simplifies several aspects of the accounting for share-based payment award transactions, including (i) income tax consequences, (ii) classification of awards as either equity or liabilities, (iii) whether or not to estimate forfeitures or account for them when they occur and (iv) classification on the statement of cash flows. The standard is effective for interim and annual periods beginning after December 31, 2016. The adoption of this guidance during the first quarter of 2017 did not have a material impact on the Company's consolidated financial position, results of operations or cash flows. In February 2016, the FASB issued ASU 2016-02, Leases, which replaces or supersedes ASC Topic 840, Leases, and is intended to increase the transparency and comparability of accounting for lease transactions. This ASU requires most leases to be recognized on the balance sheet. Lessees will need to recognize a right-of-use asset and a lease liability for virtually all leases. 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. Lessor accounting remains similar to the current model. Targeted improvements were made to lessor accounting to align, where necessary, with certain changes to the lessee model and the new revenue recognition standard. The ASU will require both quantitative and qualitative disclosures regarding key information about leasing arrangements. The standard is effective for fiscal years, and interim periods within those fiscal years, 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 evaluating the impact of this standard on its consolidated financial statements and disclosures. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 supersedes the revenue recognition requirements in Revenue Recognition (Topic 605), and requires entities to recognize revenue in a way that depicts 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 revenue recognition standard also requires disclosures that sufficiently describe the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. This ASU was amended by ASU No. 2015-14, issued in August 2015, which deferred the original effective date by one year; the effective date of this ASU is for fiscal years, and interim reporting periods within those years, beginning after December 15, 2017, using one of two retrospective application methods. In addition, the FASB issued other amendments during 2016 to FASB ASC Topic 606, Revenue from Contracts with Customers, which include implementation guidance to principal versus agent considerations, guidance to identifying performance obligations and licensing guidance and other narrow scope improvements. The Company expects to adopt this new guidance on January 1, 2018 using the modified retrospective application method. As part of the Company's implementation plan for this new standard, the Company has assessed the impact of these new standards on its business processes, business and accounting systems, and consolidated financial statements and related disclosures by evaluating the terms and conditions of samples of both standard and non-standard contracts across the Company's in-scope business segments in light of the new standards. At this time, the Company only expects slight modifications to accounting for repair work in progress, resulting in immaterial changes to business processes and systems. To date, the Company has not identified any other material differences in its existing revenue recognition methods or contract costs that would require modification under the new standards.

Recent Accounting Pronouncements

In May 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2017-09, Compensation—Stock Compensation (Topic 718) – Scope of Modification Accounting. The amendments included in this update provide guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The amendments in this update will be applied prospectively to an award modified on or after the adoption date. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. The Company is currently evaluating the impact of this guidance on our consolidated financial position, results of operations, comprehensive income, cash flows and disclosures.

In November 2016, the FASB issued ASU No. 2016-18, Restricted Cash, which amends Accounting Standards Codification (ASC) Topic 230, Statement of Cash Flows. This ASU requires that the statement of cash flows explain the change during the period in total cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. This ASU is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on our consolidated financial position, results of operations, comprehensive income, cash flows and disclosures.

In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments, which amends ASC Topic 230, Statement of Cash Flows. This ASU seeks to reduce the diversity currently in practice by providing guidance on the presentation of eight specific cash flow issues in the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is currently evaluating the impact of this guidance on our consolidated statement of cash flows.

In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which amends ASC Topic 718, Compensation - Stock Compensation. This ASU simplifies several aspects of the accounting for share-based payment award transactions, including (i) income tax consequences, (ii) classification of awards as either equity or liabilities, (iii) whether or not to estimate forfeitures or account for them when they occur and (iv) classification on the statement of cash flows. The standard is effective for interim and annual periods beginning after December 31, 2016. The adoption of this guidance during the first quarter of 2017 did not have a material impact on the Company's consolidated financial position, results of operations or cash flows.

In February 2016, the FASB issued ASU 2016-02, Leases, which replaces or supersedes ASC Topic 840, Leases, and is intended to increase the transparency and comparability of accounting for lease transactions. This ASU requires most leases to be recognized on the balance sheet. Lessees will need to recognize a right-of-use asset and a lease liability for virtually all leases. 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. Lessor accounting remains similar to the current model. Targeted improvements were made to lessor accounting to align, where necessary, with certain changes to the lessee model and the new revenue recognition standard. The ASU will require both quantitative and qualitative disclosures regarding key information about leasing arrangements. The standard is effective for fiscal years, and interim periods within those fiscal years, 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 evaluating the impact of this standard on its consolidated financial statements and disclosures.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 supersedes the revenue recognition requirements in Revenue Recognition (Topic 605), and requires entities to recognize revenue in a way that depicts 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 revenue recognition standard also requires disclosures that sufficiently describe the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. This ASU was amended by ASU No. 2015-14, issued in August 2015, which deferred the original effective date by one year; the effective date of this ASU is for fiscal years, and interim reporting periods within those years, beginning after December 15, 2017, using one of two retrospective application methods. In addition, the FASB issued other amendments during 2016 to FASB ASC Topic 606, Revenue from Contracts with Customers, which include implementation guidance to principal versus agent considerations, guidance to identifying performance obligations and licensing guidance and other narrow scope improvements. The Company expects to adopt this new guidance on January 1, 2018 using the modified retrospective application method. As part of the Company's implementation plan for this new standard, the Company has assessed the impact of these new standards on its business processes, business and accounting systems, and consolidated financial statements and related disclosures by evaluating the terms and conditions of samples of both standard and non-standard contracts across the Company's in-scope business segments in light of the new standards. At this time, the Company only expects slight modifications to accounting for repair work in progress, resulting in immaterial changes to business processes and systems. To date, the Company has not identified any other material differences in its existing revenue recognition methods or contract costs that would require modification under the new standards.