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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	$ 1,021	$ 10,657
Basic-weighted average shares outstanding (in shares)	28,173	28,008
Effect of dilutive potential securities (in shares)	861	565
Diluted- weighted average shares outstanding (in shares)	29,034	28,573
Basic (in dollars per share)	$ 0.04	$ 0.38
Diluted (in dollars per share)	$ 0.04	$ 0.37
Antidilutive securities excluded from computation of earnings per share (in shares)	300	400
Option indexed to issuer's equity, strike price (in dollars per share)	$ 114.92

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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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