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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 6,970	$ 5,825	$ 13,686	$ 25,201
Basic-weighted average shares outstanding (in shares)	28,353	28,124	28,280	28,096
Effect of dilutive potential securities (in shares)	1,439	964	1,074	776
Diluted- weighted average shares outstanding (in shares)	29,792	29,088	29,354	28,872
Basic (in dollars per share)	$ 0.25	$ 0.21	$ 0.48	$ 0.90
Diluted (in dollars per share)	$ 0.23	$ 0.20	$ 0.47	$ 0.87
Antidilutive securities excluded from computation of earnings per share (in shares)	800	0	700	600
Incremental common shares attributable to dilutive effect of conversion of debt securities (in shares)	200

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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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