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Stock-Based Compensation (Schedule of Company's Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Balance options outstanding, beginning (in shares)	9,000	38,689	59,948
Granted (in shares)	0	0	0
Exercised (in shares)	(9,000)	(29,689)	(21,259)
Forfeited (in shares)	0	0	0
Expired (in shares)	0	0	0
Balance options outstanding, end (in shares)	0	9,000	38,689
Exercisable, end of period (in shares)	0
Weighted- Average Exercise Price
Balance, beginning (in dollars per share)	$ 14.35	$ 16.09	$ 17.18
Granted (in dollars per share)	0	0	0
Exercised (in dollars per share)	14.35	16.61	19.16
Forfeited (in dollars per share)	0	0	0
Expired (in dollars per share)	0	0	0
Balance, ending (in dollars per share)	0	$ 14.35	$ 16.09
Exercisable (in dollars per share)	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Contractual Term, outstanding	0 years
Weighted- Average Contractual Term, exercisable	0 years
Aggregate Intrinsic Value, Exercises in period	$ 203,963	$ 659,743	$ 236,584
Aggregate Intrinsic Value, outstanding	0
Aggregate Intrinsic Value, exercisable	$ 0

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Weighted average price of options that were either forfeited or expired.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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