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Retirement Plans, Summary of Asset Allocation (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	100.00%	100.00%
U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	51.00%	50.00%
Target allocations, minimum	30.00%
Target allocations	50.00%
Target allocations, maximum	70.00%
International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	19.00%	18.00%
Target allocations, minimum	0.00%
Target allocations	20.00%
Target allocations, maximum	30.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	30.00%	28.00%
Target allocations, minimum	15.00%
Target allocations	30.00%
Target allocations, maximum	55.00%
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	0.00%	4.00%
Target allocations, minimum	0.00%
Target allocations	0.00%
Target allocations, maximum	5.00%

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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