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Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net income, basic EPS	$ 16,619	$ (3,569)	$ 32,828	$ 20,717
Basic EPS (in shares)	53,431	50,150	51,434	48,332
Basic EPS (in dollars per share)	$ 0.31	$ (0.07)	$ 0.64	$ 0.43
Effect of dilutive stock options and warrants (in shares)	1,672	1,449	1,662	1,223
Net income, diluted EPS	$ 16,619	$ (3,569)	$ 32,828	$ 20,717
Diluted EPS (in shares)	55,103	51,599	53,096	49,555
Diluted EPS (in dollars per share)	$ 0.30	$ (0.07)	$ 0.62	$ 0.42
Stock options excluded from the calculation of common stock equivalents as the impact was anti-dilutive (in shares)	667	200	462	434

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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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