Retirement Plans - Defined Contribution Plan (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined contribution plan disclosures
Employer's matching contribution for every dollar the employees contribute (as a percent)	50.00%
Employer's matching contribution, vesting period (in years)	5 years
Aggregate employer's contribution to pension plans	$ 3.0	$ 2.7	$ 2.6
Maximum
Defined contribution plan disclosures
Employer's contribution as a percentage of employee's eligible compensation	3.00%
Employer's contribution as a percentage of the maximum an employee is permitted to contribute under IRS limits	3.00%

Amount of cost for defined contribution plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- 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

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Represents the employer's contribution as a percentage of the maximum amount an employee is permitted to contribute under IRS limits.

+ References

No definition available.

+ Details

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- Definition

Represents the vesting period for employer's matching contribution.

+ References

No definition available.

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