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Commitments, Contingencies and Guarantees (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2015 $ 8,439,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 6,888,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 5,239,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 3,752,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 4,962,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Later years (through 2099) 7,353,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 36,633,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Operating Leases, Rent Expense 10,600,000us-gaap_LeaseAndRentalExpense 11,400,000us-gaap_LeaseAndRentalExpense 9,800,000us-gaap_LeaseAndRentalExpense
Surety Bond [Member]      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Other Commitment $ 2,300,000,000us-gaap_OtherCommitment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_SuretyBondMember