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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
401(k) Plan [Member] |  |  |
Deferral rate | 5.00% |  |
Percent of annual salary employees may contribute | 15.00% |  |
Percent matched by company up to 3 percent of employee salary | 100.00% |  |
Percent matched by company 3-5 percent of employee salary | 50.00% |  |
Matching contributions | $ 1,600 | $ 1,400 | $ 1,400
Pension Plan [Member] |  |  |
Accumulated benefit obligation | $ 36,840 | $ 36,164 | 35,615
Expected average annual rate of return, minimum | 7.00% | 7.00% |
Expected average annual rate of return, maximum | 10.00% | 10.00% |
Pension Plan [Member] | Fixed Income [Member] |  |  |
Pension plans allocated assets (percentage) | 25.00% | 25.00% |
Pension Plan [Member] | Equity Securities1 [Member] |  |  |
Pension plans allocated assets (percentage) | 75.00% | 75.00% |
SERP [Member] |  |  |
Accumulated benefit obligation | $ 5,910 | $ 5,778 | $ 5,216

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- Definition The automatic rate of deferral for employees enrolled in a defined contribution plan. + References No definition available. + Details
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- Definition The maximum expected average annual rate of return on investments. + References No definition available. + Details
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- Definition The minimum expected average annual rate of return on investments. + References No definition available. + Details
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- Definition The amount matched by the company under a defined contribution plan. + References No definition available. + Details
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- Definition The percent matched by company in the range of 3 to 5 percent of employee salary. + References No definition available. + Details
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- Definition The percent matched by company up to 3 percent of employee salary for the defined contribution plan. + References No definition available. + Details
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- Definition The percentage amount of annual salary employees may contribute to the defined contribution plan. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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