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Earnings per share (Narrative) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Earnings Per Share [Abstract]
Unvested restricted stock (in shares)	2,087,383	2,250,655	2,087,383	2,250,655	2,354,318
Number of shares excluded from diluted shares outstanding (in shares)	1,160,197	0	247,802	84,916

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Unvested

+ References

No definition available.

+ Details

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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Period Type:	duration

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- References

No definition available.

+ Details

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