XML 36 R20.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Retirement Plans | 12 Months Ended
--- | ---
Dec. 31, 2017
Retirement Benefits [Abstract] |
Retirement Plans | Retirement Plans The Company maintains a 401(k) Retirement Savings Plan for all employees that meet minimum employment criteria. The plan provides that the participants may defer eligible compensation subject to certain Internal Revenue Code maximum amounts. The Company makes matching contributions in amounts equal to 25.0% of the employee's contribution to the plan, up to a maximum of 4.0% of compensation. An additional matching contribution of 12.5%, subject to the same limit on compensation, may be made at the discretion of the Company, based upon the Company's performance. For the years ended December 31, 2017, 2016 and 2015, the Company's expense to the plan was $10.1 million, $8.2 million and $6.6 million, respectively.

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration