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Employee Benefits Plan (Details 7) - DB Pension Plan - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Total Fair Value of Plan Assets	$ 71,807	$ 68,931	$ 71,227
(Level 1)
Total Fair Value of Plan Assets	71,057	61,046
(Level 2)
Total Fair Value of Plan Assets	750	7,885
(Level 3)
Total Fair Value of Plan Assets	0	0
Cash and cash equivalents
Total Fair Value of Plan Assets	1,147	694
Cash and cash equivalents | (Level 1)
Total Fair Value of Plan Assets	1,147	694
Cash and cash equivalents | (Level 2)
Total Fair Value of Plan Assets	0	0
Cash and cash equivalents | (Level 3)
Total Fair Value of Plan Assets	0	0
U.S. Treasury securities
Total Fair Value of Plan Assets		7,599
U.S. Treasury securities | (Level 1)
Total Fair Value of Plan Assets		7,599
U.S. Treasury securities | (Level 2)
Total Fair Value of Plan Assets		0
U.S. Treasury securities | (Level 3)
Total Fair Value of Plan Assets		0
Obligations of U.S. Government sponsored entities
Total Fair Value of Plan Assets		508
Obligations of U.S. Government sponsored entities | (Level 1)
Total Fair Value of Plan Assets		0
Obligations of U.S. Government sponsored entities | (Level 2)
Total Fair Value of Plan Assets		508
Obligations of U.S. Government sponsored entities | (Level 3)
Total Fair Value of Plan Assets		0
Corporate bonds and notes
Total Fair Value of Plan Assets		6,627
Corporate bonds and notes | (Level 1)
Total Fair Value of Plan Assets		0
Corporate bonds and notes | (Level 2)
Total Fair Value of Plan Assets		6,627
Corporate bonds and notes | (Level 3)
Total Fair Value of Plan Assets		0
Common stocks
Total Fair Value of Plan Assets	23,291	25,324
Common stocks | (Level 1)
Total Fair Value of Plan Assets	23,291	25,324
Common stocks | (Level 2)
Total Fair Value of Plan Assets	0	0
Common stocks | (Level 3)
Total Fair Value of Plan Assets	0	0
Mutual funds
Total Fair Value of Plan Assets	46,619	27,429
Mutual funds | (Level 1)
Total Fair Value of Plan Assets	46,619	27,429
Mutual funds | (Level 2)
Total Fair Value of Plan Assets	0	0
Mutual funds | (Level 3)
Total Fair Value of Plan Assets	0	0
Preferred stocks
Total Fair Value of Plan Assets	750	750
Preferred stocks | (Level 1)
Total Fair Value of Plan Assets	0	0
Preferred stocks | (Level 2)
Total Fair Value of Plan Assets	750	750
Preferred stocks | (Level 3)
Total Fair Value of Plan Assets	$ 0	$ 0

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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 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: 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=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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