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Employee Benefit Plans (Detail Textuals) - Pension Benefits $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Defined Benefit Plan Disclosure
Percentage of employer match	3.00%
Defined benefit plan contributions by employer percent	6.00%
Contribution to defined benefit plan in the second quarter of 2018	$ 1.8
Defined benefit plan, minimum required contribution	$ 1.0

X

- Definition

Represents Defined Benefit Plan Contributions Minimum Required Contribution.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: