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General & Administrative Expenses - Compensation of Executives and Directors (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Key Management Personnel Compensation [Abstract]      
Cash compensation $ 4,171 $ 4,162 $ 5,434
Pension cost 155 158 167
Compensation related to options and restricted stock 4,107 6,227 6,223
Total remuneration $ 8,433 $ 10,547 $ 11,823