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Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 84,770 |  | $ 68,435 |
Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 84,671 | [1] | $ 68,349 | [2]
U.S. Equity Funds [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 28.00% |  | 32.00% |
U.S. Fixed Income Funds [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 37.00% |  | 38.00% |
Non-U.S. Equity Funds [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 20.00% |  | 15.00% |
Other [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 15.00% |  | 15.00% |
Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 99 |  | $ 86 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 84,770 |  | 68,435 |
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 84,671 | [1] | 68,349 | [2]
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 99 |  | 86 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [2]
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [2]
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 0 |  | $ 0 |
[1] | Mutual funds were invested 28% in U.S. equity funds, 37% in U.S. fixed income funds, 20% in non-U.S. equity funds and 15% in other.
[2] | Mutual funds were invested 32% in U.S. equity funds, 38% in U.S. fixed income funds, 15% in non-U.S. equity funds and 15% in other.

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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 + Details
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