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v3.19.1

General and administrative expenses - Summary of activity for restricted stock awards (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Restricted common stock |  |  |  |
Outstanding beginning of period |  | 1,086,331 | 1,376,820 | 1,385,832
Outstanding end of period |  | 545,500 | 1,086,331 | 1,376,820
Granted |  | 567,000 | 900,000 | 824,000
Exercised | [1] | 1,085,331 | 1,132,988 | 833,012
Forfeited |  | 22,500 | 57,501 | 0
Share options |  |  |  |
Outstanding |  | 0 | 310,000 | 310,000
Forfeited |  | 310,000 | 0 | 0
Weighted average exercise price |  |  |  |
Outstanding | [2] | $ 0 | $ 9.64 | $ 9.64
Forfeited |  | $ 9.64 | $ 0 | $ 0
[1] | Does not include shares in lieu of dividends.
[2] | To be adjusted for dividends declared and paid subsequent to the respective grant dates.

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