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Employee Benefit Plans (Schedule of Fair Value of Pension Plan Assets) (Details) - Pension Benefit Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair value of plan assets	$ 69,215	$ 59,370	$ 52,931
Fair Value, Level 1 [Member]
Fair value of plan assets	69,215	59,370
Fair Value, Level 2 [Member]
Fair value of plan assets
Fair Value, Level 3 [Member]
Fair value of plan assets
Equity Securities [Member]
Fair value of plan assets	10,930	9,283
Equity Securities [Member] | Fair Value, Level 2 [Member]
Fair value of plan assets
Equity Securities [Member] | Fair Value, Level 3 [Member]
Fair value of plan assets
Mutual Funds [Member]
Fair value of plan assets	57,608	49,439
Mutual Funds [Member] | Fair Value, Level 1 [Member]
Fair value of plan assets	57,608	49,439
Mutual Funds [Member] | Fair Value, Level 2 [Member]
Fair value of plan assets
Mutual Funds [Member] | Fair Value, Level 3 [Member]
Fair value of plan assets
Money Market Funds [Member]
Fair value of plan assets	677	648
Money Market Funds [Member] | Fair Value, Level 1 [Member]
Fair value of plan assets	677	648
Money Market Funds [Member] | Fair Value, Level 2 [Member]
Fair value of plan assets
Money Market Funds [Member] | Fair Value, Level 3 [Member]
Fair value of plan assets
Equity Securities [Member] | Fair Value, Level 1 [Member]
Fair value of plan assets	10,930	$ 9,283
Equity Securities [Member] | Fair Value, Level 2 [Member]
Fair value of plan assets

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

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