Commitments And Contingencies (Leases) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, 2014	$ 18,146,000
Operating Leases, 2013	14,962,000
Operating Leases, 2014	11,959,000
Operating Leases, 2015	8,946,000
Operating Leases, 2019	5,305,000
Operating Leases, Thereafter	6,597,000
Operating Leases, Future Minimum Payments Due, Total	65,915,000
Minimum Sublease Income, 2014	0
Minimum Sublease Income, 2015	0
Minimum Sublease Income, 2016	0
Minimum Sublease Income, 2017	0
Minimum Sublease Income, 2018	0
Minimum Sublease Income, Thereafter	0
Minimum Sublease Income, Total minimum lease payments	0
Operating Leases Net, 2014	18,146,000
Operating Leases Net, 2015	14,962,000
Operating Leases Net, 2016	11,959,000
Operating Leases Net, 2017	8,946,000
Operating Leases Net, 2018	5,305,000
Operating Leases Net, Thereafter	6,597,000
Operating Leases Net, Total minimum lease payments	65,915,000
Rental expense	28,700,000	26,900,000	26,700,000
Airplane Operating Lease Period Years	5
Residual value guarantee liability				7,800,000
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold				9,500,000
ResidualValueGuaranteePayment					$ 9,500,000