Note 10 - Developments in Accounting Pronouncements	6 Months Ended
Jun. 30, 2019
Notes to Financial Statements
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	*Note 10.* Developments in Accounting Pronouncements** Accounting Standards Updates Adopted In February 2016, the FASB issued ASU No. 2016-02 Leases (Topic 842). The update modified the classification criteria and requires lessees to recognize the assets and liabilities on the balance sheet for most leases. The update was effective for fiscal years beginning after December 15, 2018, with early adoption permitted. We adopted the guidance effective January 1, 2019, and recognized a liability and right-of-use asset of $22.4 million as of that date for our identified operating leases. We elected the transition option to apply the new guidance as of that effective date without adjusting comparative periods presented. In the adoption of ASU No. 2016-02, we elected to not assess leases with terms less than twelve months in length. We also elected practical expedients which permitted us to forgo reassessing the following upon adoption: (i) whether any expired or existing contracts are or contain leases, (ii) the classification of leases as operating or capital under the previous accounting guidance, and (iii) treatment of initial indirect costs for any existing leases. In addition, we elected to not reassess whether land easements represent leases, as we did not treat them as leases under the previous guidance. See Note 9 for information on our leases. In August 2017, the FASB issued ASU No. 2017-12 Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The objective of the update is to improve the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements, and simplify the application of existing hedge accounting guidance. The update was effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. Adoption of this update as of January 1, 2019 did not have a material impact on our consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in the update allow a reclassification from other comprehensive income to retained earnings for "stranded" tax effects resulting from the reduction in the historical corporate tax rate under the Tax Cuts and Jobs Act enacted in December 2017. The update was effective for fiscal years beginning after December 15, 2018. We elected to not reclassify stranded tax effects, and adoption of this update as of January 1, 2019 did not have a material impact on our consolidated financial statements. In June 2018, the FASB issued ASU No. 2018-07 Compensation - Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. The update involves simplification of several aspects of accounting for nonemployee share-based payment transactions by expanding the scope of Topic 718 to include nonemployee awards. The update was effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. Adoption of this update as of January 1, 2019 did not have a material impact on our consolidated financial statements. Accounting Standards Updates to Become Effective in Future Periods In August 2018, the FASB issued ASU No. 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The update removes, modifies and makes additions to certain disclosure requirements with respect to fair value measurements. The update is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. We are evaluating the impact of this update on our fair value measurement disclosures. In August 2018, the FASB issued ASU No. 2018-14 Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans. The update removes several disclosure requirements, adds two new disclosure requirements, and clarifies other disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans. The update is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. We are evaluating the impact of this update on our disclosures involving our defined benefit pension plans.

Note 10 - Developments in Accounting Pronouncements

6 Months Ended

Jun. 30, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Text Block]

Note 10. Developments in Accounting Pronouncements

Accounting Standards Updates Adopted

In February 2016, the FASB issued ASU No. 2016-02 Leases (Topic 842). The update modified the classification criteria and requires lessees to recognize the assets and liabilities on the balance sheet for most leases. The update was effective for fiscal years beginning after December 15, 2018, with early adoption permitted. We adopted the guidance effective January 1, 2019, and recognized a liability and right-of-use asset of $22.4 million as of that date for our identified operating leases. We elected the transition option to apply the new guidance as of that effective date without adjusting comparative periods presented. In the adoption of ASU No. 2016-02, we elected to not assess leases with terms less than twelve months in length. We also elected practical expedients which permitted us to forgo reassessing the following upon adoption: (i) whether any expired or existing contracts are or contain leases, (ii) the classification of leases as operating or capital under the previous accounting guidance, and (iii) treatment of initial indirect costs for any existing leases. In addition, we elected to not reassess whether land easements represent leases, as we did not treat them as leases under the previous guidance. See Note 9 for information on our leases.

In August 2017, the FASB issued ASU No. 2017-12 Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The objective of the update is to improve the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements, and simplify the application of existing hedge accounting guidance. The update was effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. Adoption of this update as of January 1, 2019 did not have a material impact on our consolidated financial statements.

In February 2018, the FASB issued ASU No. 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in the update allow a reclassification from other comprehensive income to retained earnings for "stranded" tax effects resulting from the reduction in the historical corporate tax rate under the Tax Cuts and Jobs Act enacted in December 2017. The update was effective for fiscal years beginning after December 15, 2018. We elected to not reclassify stranded tax effects, and adoption of this update as of January 1, 2019 did not have a material impact on our consolidated financial statements.

In June 2018, the FASB issued ASU No. 2018-07 Compensation - Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. The update involves simplification of several aspects of accounting for nonemployee share-based payment transactions by expanding the scope of Topic 718 to include nonemployee awards. The update was effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. Adoption of this update as of January 1, 2019 did not have a material impact on our consolidated financial statements.

Accounting Standards Updates to Become Effective in Future Periods

In August 2018, the FASB issued ASU No. 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The update removes, modifies and makes additions to certain disclosure requirements with respect to fair value measurements. The update is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. We are evaluating the impact of this update on our fair value measurement disclosures.

In August 2018, the FASB issued ASU No. 2018-14 Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans. The update removes several disclosure requirements, adds two new disclosure requirements, and clarifies other disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans. The update is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. We are evaluating the impact of this update on our disclosures involving our defined benefit pension plans.