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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
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Contribution Plan Disclosure [Line Items]
Company matching contribution to defined contribution (401(k)) plans	$ 1,547us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 1,138us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 748us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

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- Details

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration