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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)

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