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Share-Based Payments (Summary of Stock Option Transactions under Share-Based Payment Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Outstanding at December 31, 2016, number of shares	355,391
Granted in 2017, numbers of shares	0
Exercised in 2017, number of shares	(120,496)
Forfeited or expired 2017, number of shares	(5,031)
Outstanding at December 31, 2017, number of shares	229,864	355,391
Exercisable at December 31, 2017, number of shares	229,864
Outstanding at December 31, 2016, weighted average exercise price	$ 16.87
Granted in 2017, weighted average exercise price	0.00
Exercised in 2017, weighted average exercise price	19.39
Forfeited or expired 2017, weighted average exercise price	24.54
Outstanding at December 31, 2017, weighted average exercise price	15.38	$ 16.87
Exercisable as December 31, 2017, weighted average exercise price	$ 15.38
Outstanding at December 31, 2017, weighted average remaining contractual life in years	1 year 6 months
Exercisable at December 31, 2017, weighted average remaining contractual life in years	1 year 6 months
Outstanding at December 31, 2017, aggregate intrinsic value	$ 9,958
Exerciseable at December 31, 2017, aggregate intrinsic value	9,958
Total intrinsic value of options exercised	$ 4,000	$ 2,300	$ 2,200

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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- Definition

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.

+ References

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- Definition

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.

+ References

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X

- Definition

For presentations that combine terminations, 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 or that expired.

+ References

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- Definition

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

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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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 per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Number of share options (or share units) exercised during the current period.

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