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Pension and Other Postretirement Benefits Company matching contribution to defined contribution 401(K) plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Contribution Plan Disclosure [Line Items] |  |  |
Company matching contribution to defined contribution (401(k)) plans | $ 1,547 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 1,138 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 748 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

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- Details
Name: | us-gaap_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration