Nature of operations and presentation of financial statements (Policies)	3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	Basis of presentation The accompanying condensed consolidated financial statements have been prepared pursuant to SEC regulations whereby certain information normally included in GAAP financial statements has been condensed or omitted. The financial information presented herein reflects all adjustments (consisting only of normal, recurring adjustments) that are, in the opinion of management, necessary for a fair presentation of the results for the interim periods presented. The results for interim periods are not necessarily indicative of the results to be expected for the full year. We believe that the disclosures included herein are adequate to make the information presented not misleading in any material respect when read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report. Those audited consolidated financial statements include a summary of our significant accounting policies.
Principles of consolidation	Principles of consolidation All intercompany balances and transactions have been eliminated from the financial statements.
Use of estimates	Use of estimates The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported throughout the financial statements. Actual results could differ from those estimates.

Nature of operations and presentation of financial statements (Policies)

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying condensed consolidated financial statements have been prepared pursuant to SEC regulations whereby certain information normally included in GAAP financial statements has been condensed or omitted. The financial information presented herein reflects all adjustments (consisting only of normal, recurring adjustments) that are, in the opinion of management, necessary for a fair presentation of the results for the interim periods presented. The results for interim periods are not necessarily indicative of the results to be expected for the full year.

We believe that the disclosures included herein are adequate to make the information presented not misleading in any material respect when read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report. Those audited consolidated financial statements include a summary of our significant accounting policies.

Principles of consolidation

All intercompany balances and transactions have been eliminated from the financial statements.

Use of estimates

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported throughout the financial statements. Actual results could differ from those estimates.