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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |  |  |
Total retirement plan expense | $ 2,816 us-gaap_PostemploymentBenefitsPeriodExpense | $ 2,838 us-gaap_PostemploymentBenefitsPeriodExpense | $ 2,884 us-gaap_PostemploymentBenefitsPeriodExpense

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

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- Definition Period expense related to postemployment benefits. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration