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Earnings (Loss) Per Share (EPS) - Schedule of Diluted Earnings Per Shares Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Calculation of net income (loss) per share:
Net income (loss)	$ 13,910	$ 6,583
Basic weighted average shares outstanding (in shares)	49,775	49,474
Basic income (loss) per share (in dollars per share)	$ 0.28	$ 0.13
Effect of stock options outstanding:
Basic weighted average shares outstanding (in shares)	49,775	49,474
Effect from dilutive shares and options outstanding (in shares)	340	550
Diluted weighted average shares (in shares)	50,115	50,024
Diluted income (loss) per share (in dollars per share)	$ 0.28	$ 0.13

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