Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Earnings per share (Narrative) (Details)

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Earnings per share (Narrative) (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Unvested restricted stock (in shares) 2,354,318 2,429,442 3,007,752
Number of shares excluded from diluted shares outstanding (in shares) 163,067 90,929 509,677