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Stock-Based Compensation (Details) - Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding beginning	245,717	730,605	1,008,781
Options, Exercised	(79,797)	(443,283)	(267,440)
Options, Forfeited		(933)	(1,290)
Options, Expired		(40,672)	(9,446)
Options, Outstanding ending	165,920	245,717	730,605
Weighted-Average Exercise Price, Outstanding beginning	$ 19.82	$ 16.40	$ 13.87
Weighted-Average Exercise Price, Exercised	15.43	14.03	7.19
Weighted-Average Exercise Price, Forfeited		24.68	23.14
Weighted Average Exercise Price, Expired		21.40	5.92
Weighted-Average Exercise Price, Outstanding ending	$ 21.92	$ 19.82	$ 16.40
Outstanding Weighted Average Remaining Contractual Term	4 years 2 months 12 days	4 years 4 months 24 days	3 years 7 months 6 days
Outstanding, Aggregate Intrinsic Value	$ 2,292	$ 4,396	$ 3,722

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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