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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Shares not included in computation of diluted weighted average earnings per common (in shares)	0	300,000	2,000	100,000
Net income attributable to common shareholders	$ 16,144	$ 7,528	$ 36,200	$ 13,789
Basic weighted average common shares outstanding (in shares)	5,866,000	5,878,000	5,823,000	5,990,000
Potentially dilutive common shares (in shares)	195,000	113,000	197,000	133,000
Diluted weighted average common shares outstanding (in shares)	6,061,000	5,991,000	6,020,000	6,123,000
Basic weighted average earnings per common share (in dollars per share)	$ 2.75	$ 1.28	$ 6.22	$ 2.30
Diluted weighted average earnings per common share (in dollars per share)	$ 2.66	$ 1.26	$ 6.01	$ 2.25

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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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