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Employee Retirement Plans (Schedule of Total Expense for All Retirement Plans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Total retirement plan expense	$ 2,816us-gaap_PostemploymentBenefitsPeriodExpense	$ 2,838us-gaap_PostemploymentBenefitsPeriodExpense	$ 2,884us-gaap_PostemploymentBenefitsPeriodExpense

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- Details

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Period Type:	duration

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- Definition

Period expense related to postemployment benefits.

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No definition available.

+ Details

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