Employee Benefit Plans - Expected Benefit Payments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Estimated future employer contributions in next fiscal year, description	The Company has no mandatory pension contribution requirements in 2015, but may make discretionary contributions.
Pension Benefits [Member]
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
2015	2,729
2016	2,866
2017	3,041
2018	3,231
2019	3,450
2020 - 2024	20,807
Postretirement Benefits [Member]
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
2015	25
2016	27
2017	28
2018	30
2019	33
2020 - 2024	201

Name:	us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Descriptive information regarding the employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Description may include a range of expected contributions, required minimum contribution, whether the expected contribution is discretionary, and further explanation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

+ References