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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 02, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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		$ 2,300	$ 1,600	$ 1,400
401(k) Plan [Member] | Subsequent Event [Member]
Percent matched by company up to 6 percent of employee salary	100.00%
Pension Plan [Member]
Accumulated benefit obligation		$ 38,150	$ 36,840	36,164
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		$ 5,970	$ 5,910	$ 5,778

X

- Definition

The automatic rate of deferral for employees enrolled in a defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

The maximum expected average annual rate of return on investments.

+ References

No definition available.

+ Details

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X

- Definition

The minimum expected average annual rate of return on investments.

+ References

No definition available.

+ Details

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X

- 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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X

- Definition

The percent matched by company up to 6 percent of employee salary.

+ References

No definition available.

+ Details

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X

- 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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X

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ 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 (e)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

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X

- 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=82843861&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=82843861&loc=d3e1928-114920

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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