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Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligations (Details) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Discount rate | 4.58% | 4.88% | 4.42%
Rate of compensation increase |  |  |
Ages 50 and over [Member] |  |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Rate of compensation increase | 3000.00% | 3000.00% | 3000.00%
Ages 40-49 [Domain] |  |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Rate of compensation increase | 4.00% | 3.00% | 3.00%
Ages 30-39 [Member] [Member] |  |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Rate of compensation increase | 6.00% | 6.00% | 6.00%
Under age 30 [Member] |  |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Rate of compensation increase | 10.00% | 10.00% | 10.00%

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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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