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Basis of Presentation - Reconciliation of Earnings Per Share (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
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average basic shares outstanding (shares)	6,950	6,123	6,936	6,109
Potentially dilutive common shares related to:
Stock options (shares)	88	53	79	55
Unvested restricted stock awards (shares)	17	15	16	15
Weighted average diluted shares outstanding (shares)	7,055	6,191	7,031	6,179
Net income	$ 8,680	$ 5,132	$ 22,960	$ 14,866
Basic EPS (usd per share)	$ 1.25	$ 0.84	$ 3.31	$ 2.43
Diluted EPS (usd per share)	$ 1.23	$ 0.83	$ 3.27	$ 2.41
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (shares)	0	23	1	19

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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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