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Employee Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Quoted Prices in Market for Identical Assets (Level 1) [Member]
Fair value of plan assets		$ 27,360
Significant Other Observable Inputs (Level 2) [Member]
Fair value of plan assets	41,306	9,590
Significant Other Observable Inputs (Level 3) [Member]
Fair value of plan assets
Fair Value Total [Member]
Fair value of plan assets	41,306	36,950
Fixed income investments - Money market funds [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member]
Fair value of plan assets
Fixed income investments - Money market funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of plan assets	41,306	9,590
Fixed income investments - Money market funds [Member] | Significant Other Observable Inputs (Level 3) [Member]
Fair value of plan assets
Fixed income investments - Money market funds [Member] | Fair Value Total [Member]
Fair value of plan assets	$ 41,306	9,590
Equity investments - Large cap value fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member]
Fair value of plan assets		15,595
Equity investments - Large cap value fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of plan assets
Equity investments - Large cap value fund [Member] | Significant Other Observable Inputs (Level 3) [Member]
Fair value of plan assets
Equity investments - Large cap value fund [Member] | Fair Value Total [Member]
Fair value of plan assets		15,595
Equity investments - Small cap growth fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member]
Fair value of plan assets		2,624
Equity investments - Small cap growth fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of plan assets
Equity investments - Small cap growth fund [Member] | Significant Other Observable Inputs (Level 3) [Member]
Fair value of plan assets
Equity investments - Small cap growth fund [Member] | Fair Value Total [Member]
Fair value of plan assets		2,624
Equity investments - Mid cap growth fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member]
Fair value of plan assets		3,220
Equity investments - Mid cap growth fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of plan assets
Equity investments - Mid cap growth fund [Member] | Significant Other Observable Inputs (Level 3) [Member]
Fair value of plan assets
Equity investments - Mid cap growth fund [Member] | Fair Value Total [Member]
Fair value of plan assets		3,220
Equity investments - Foreign equity fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member]
Fair value of plan assets		2,669
Equity investments - Foreign equity fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of plan assets
Equity investments - Foreign equity fund [Member] | Significant Other Observable Inputs (Level 3) [Member]
Fair value of plan assets
Equity investments - Foreign equity fund [Member] | Fair Value Total [Member]
Fair value of plan assets		2,669
Equity investments - Company stock [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member]
Fair value of plan assets		3,252
Equity investments - Company stock [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of plan assets
Equity investments - Company stock [Member] | Significant Other Observable Inputs (Level 3) [Member]
Fair value of plan assets
Equity investments - Company stock [Member] | Fair Value Total [Member]
Fair value of plan assets		$ 3,252

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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

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