Defined Contribution Plan, Employee Contributions, Percentage of Eligible Compensation

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- Definition

Defined Contribution Plan, Maximum Annual Contributions Per Employee, Tranche Two, Percent

+ References

No definition available.

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- Definition

Initial Employer 401(K) Matching Contribution to Employee

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No definition available.

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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.

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No definition available.

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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

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- Definition

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

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No definition available.

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Compensation Arrangements - 401(k) Defined Contribution Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Maximum 401 (k) plan contribution rates as percentage of employees earnings	75.00%
Employer matching contribution, maximum (percentage)	100.00%
Initial employer 401(k) matching contribution to employee (percentage)	4.00%
Employer 401 (k) matching contribution to employee, 50% Maximum	50.00%
Compensation expense related to 401(k) savings plan	$ 5.7	$ 5.4	$ 4.7
Maximum
Defined Benefit Plan Disclosure [Line Items]
Initial employer 401(k) matching contribution to employee (percentage)	3.00%
Minimum
Defined Benefit Plan Disclosure [Line Items]
Initial employer 401(k) matching contribution to employee (percentage)	2.00%