Quarterly report pursuant to Section 13 or 15(d)

Benefit Plans (Details 4)

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Benefit Plans (Details 4) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Defined Contribution Plan Disclosure        
Defined Contribution Plan, Cost Recognized $ 8,078,000 $ 8,810,000 $ 15,523,000 $ 14,914,000
SupplementalExecutiveRetirementPlanAndSupplementalRetirementIncomePlan 578,000 487,000 1,157,000 963,000
BenefitCost $ 8,656,000 $ 9,297,000 $ 16,680,000 $ 15,877,000