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Earnings per Share (Schedule of Earnings per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Earnings per Share [abstract]    
Net income for the year $ 66,305 $ 17,858
Weighted average number of shares ('000's) 158,036 136,888
Earnings per share - basic $ 0.42 $ 0.13
Incremental shares from options 250 236
Incremental shares from warrants 26 929
Weighted average diluted number of shares (000's) 158,312 138,053
Diluted earnings per share $ 0.42 $ 0.13