Deferred Compensation Arrangement with Individual, Number of Participants

No definition available.

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- Definition

Savings Plan Minimum Age

+ References

No definition available.

+ Details

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- Definition

Deferred Compensation Arrangement with Individual, Service Period Required

+ References

No definition available.

+ Details

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- Definition

Defined Benefit Plan, Base Amount Of Death Proceeds, Annual Percentage Increase Until Retirement Age Reached

+ References

No definition available.

+ Details

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- Definition

Defined Benefit Plan, Period Death Benefit Required To Be Paid Following Participant's Death

+ References

No definition available.

+ Details

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- Definition

Defined Contribution Plan, Employer Matching Contribution, Vesting Percentage

+ References

No definition available.

+ Details

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.

+ References

No definition available.

+ Details

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- 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

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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Period Type:	duration

- 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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Period Type:	duration

- 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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- Details

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- Details

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- Details

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Employee Benefit Plans (Details) $ in Thousands	12 Months Ended
Employee Benefit Plans (Details) $ in Thousands	Dec. 31, 2018 USD ($) officers	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
401(k) Savings Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Minimum age requirement	21 years
Minimum service period required	3 months
Employer matching contribution, percent of match	75.00%
Maximum annual contribution per employee, percent	8.00%
Total cost recognized for the period	$ 5,200	$ 4,400	$ 2,600
Postretirement Life Insurance
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Base amount of death proceeds, annual percentage increase until retirement age is reached	3.00%
Period death benefit required to be paid within following participant's death	90 days
Total cost recognized for the period	$ 6,900	7,800	6,600
Deferred compensation plan \| Directors and officers
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred compensation liability	1,000	1,100
Deferred compensation plan, period expense	22	21	23
Long term incentive plan \| Named executive officers ('NEO')
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred compensation plan, period expense	$ 510	$ 455	$ 418
Number of officers currently participating in the LTIP \| officers	2
Long term incentive plan \| Named executive officers ('NEO') \| Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred compensation plan, requisite service period	5 years
Long term incentive plan \| Named executive officers ('NEO') \| Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred compensation plan, requisite service period	10 years
Vested after 2 Years of Service \| 401(k) Savings Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Vesting Percentage	25.00%
Vested after 3 Years of Service \| 401(k) Savings Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Vesting Percentage	50.00%
Vested after 4 Years of Service \| 401(k) Savings Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Vesting Percentage	75.00%
Vested after 5 or More Years of Service \| 401(k) Savings Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Vesting Percentage	100.00%