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Stockholders' Equity and Earnings Per Share (Weighted Average Number of Shares Outstanding Reconciliation) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Basic weighted average shares outstanding (in shares)	6,974	6,924
Dilutive effect of restricted stock awards (in shares)	33	36
Diluted weighted average shares outstanding (in shares)	7,007	6,960
Earnings per share:
Basic earnings per share (USD per share)	$ 5.68	$ 5.02
Diluted earnings per share (USD per share)	$ 5.66	$ 5.00

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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