For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 715
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

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The amount of the cost recognized during the period for defined contribution plans.

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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, long-term rate of return on assets	7.00%	7.50%	7.50%
Defined benefit plan, estimated future employer contribution in next fiscal year	$ 2.0
Defined contribution plan, compensation expense	$ 3.5	$ 3.7	$ 3.2
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Technology Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	21.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Financial Services Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	17.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Consumer Cyclical Goods Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	15.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Healthcare Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	15.00%
Defined Benefit Plan, Equity Investments by Sector Concentration Risk [Member] \| Equity Investment Portfolio, Total [Member] \| Industrial Sector [Member]
Defined Benefit Plan Disclosure [Line Items]
Concentrations of risk	9.00%