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Employee Benefit Plans (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) participant item | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Defined contribution plan |  |  |
Employer contribution to the plan | $ | $ 2.1 | $ 1.9 | $ 1.9
Pension Plan |  |  |
Employee benefit plans |  |  |
Minimum age for eligibility under the Pension Plan | item | 21 |  |
Minimum period of service for eligibility under the Pension Plan | 5 years |  |
Normal retirement benefit (as a percent) | 2.00% |  |
Number of highest consecutive years' average earnings used in computing retirement benefit | 5 years |  |
Maximum number of years of credited service considered in determining retirement benefit | 40 years |  |
Number of participants in the Pension Plan | participant | 969 |  |
Pension Plan |  |  |
Defined contribution plan |  |  |
Percentage of participant's eligible pay contributed to the plan by the employer | 5.25% |  |
Eligibility for employer matching contributions, period of service | 3 years |  |

X
- Definition Represents the maximum number of years of credited service used in computing the retirement benefit. + References No definition available. + Details
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- Definition Represents the minimum age required by the employees to be eligible to participate in the plan. + References No definition available. + Details
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- Definition Represents the minimum period of service required in order to participate in the plan. + References No definition available. + Details
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- Definition Represents the number of highest consecutive years' average earnings used in computing the retirement benefit. + References No definition available. + Details
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- Definition Defined Benefit Plan, Number of Employees Covered + References No definition available. + Details
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- Definition Represents the percentage of normal retirement benefit. + References No definition available. + Details
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- Definition The period of service required in order to be eligible for the employer's matching contributions. + References No definition available. + 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 The amount of the cost recognized during the period for defined contribution plans. + 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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- 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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