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General and administrative expenses - Compensation of executives and directors (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Key Management Personnel Compensation [Abstract]      
Cash compensation $ 3,989 [1] $ 4,171 $ 4,162
Pension cost 202 [1] 155 158
Compensation related to options and restricted stock [2] 2,250 4,107 6,227
Total remuneration $ 6,441 $ 8,433 $ 10,547
[1] Compensation for 2018 includes full year compensation for both current and former chief financial officer.
[2] Share compensation reflects the expense recognized.