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Income Taxes (Schedule of Income Tax Allocation) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Allocated to net income	$ 1,300	$ 21,767	$ 14,624	$ 14,126
Allocated to stockholders' equity, for unrealized holding gain/loss on		321	(685)	(184)
Allocated to stockholders' equity, for tax benefit of pension liabilities		668	(36)	(1,716)
Total income taxes		$ 22,756	$ 13,903	$ 12,226

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The tax effect of items occurring during the period that have been charged or credited directly to components of shareholders' equity and are not otherwise defined.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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Amount of income tax expense (benefit) for continuing operations, discontinued operations, other comprehensive income, and items charged (credited) directly to shareholders' equity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 20
-Section 45
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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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