Retirement Plans, Fair Value of Pension Plan Investments Table (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Pension Plan Investments
Money market account	$ 481	$ 2,868
Mutual funds	168,982	185,483
Common /collective trust funds	120,136	115,145
Total Pension Plan Investments	289,599	303,496
Fair Value, Inputs, Level 1 [Member]
Pension Plan Investments
Money market account	481	2,868
Mutual funds	168,982	185,483
Common /collective trust funds	0	0
Total Pension Plan Investments	169,463	188,351
Fair Value, Inputs, Level 2 [Member]
Pension Plan Investments
Money market account	0	0
Mutual funds	0	0
Common /collective trust funds	120,136	115,145
Total Pension Plan Investments	120,136	115,145
Fair Value, Inputs, Level 3 [Member]
Pension Plan Investments
Money market account	0	0
Mutual funds	0	0
Common /collective trust funds	0	0
Total Pension Plan Investments	$ 0	$ 0

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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=49178875&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=58740216&loc=d3e1928-114920

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Balance Type:	debit
Period Type:	instant