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Net Income (Loss) Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Net income (loss) $ 27,830 $ (1,569) $ 86,599 $ (32,990)
Basic weighted average shares outstanding (in Shares) 48,181 49,075 48,130 49,016
Add effects of share-based compensation instruments (in Shares) 353 0 209 0
Diluted weighted average shares outstanding (in Shares) 48,534 49,075 48,339 49,016
Basic income (loss) per share (in Dollars per Share) $ 0.58 $ (0.03) $ 1.80 $ (0.67)
Diluted income (loss) per share (in Dollars per Share) $ 0.57 $ (0.03) $ 1.79 $ (0.67)