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General and administrative expenses - Shares held by executives and directors (Details) - shares		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares Held By Executives And Directors [Abstract]
Executives and Directors as a group	[1]	3,155,503	2,729,680	2,416,385
[1] Includes 465,000 (2017: 906,666, 2016: 1,184,155) shares of restricted stock subject to vesting conditions.

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- Definition

The disclosure of the shares held by executives and directors.

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No definition available.

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- Definition

The number of shares held by executives and directors as a group.

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No definition available.

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