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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ (7,888)	$ 28,066
Basic - weighted average shares outstanding (in shares)	109,643	108,423
Dilutive effect of stock options and restricted stock (in shares)	0	2,434
Diluted - weighted average shares outstanding (in shares)	109,643	110,857
Earnings (loss) per share
Basic (in USD per share)	$ (0.07)	$ 0.26
Diluted (in USD per share)	$ (0.07)	$ 0.25
Anti-dilutive shares excluded (in shares)		3,300

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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