Commitments and Contingencies (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Operating leases future minimum rentals and service income
Future Rental and Service Income - Operating Leases, 2012	$ 53,848
Future Rental and Service Income - Operating Leases, 2013	39,435
Future Rental and Service Income - Operating Leases, 2014	26,676
Future Rental and Service Income - Operating Leases, 2015	19,756
Future Rental and Service Income - Operating Leases, 2016	14,704
Future Rental and Service Income - Operating Leases, Future years	22,923
Future Rental and Service Income - Operating Leases, Total	177,342
Future Minimum Rental Payments, 2012	12,575
Future Minimum Rental Payments, 2013	9,014
Future Minimum Rental Payments, 2014	6,572
Future Minimum Rental Payments, 2015	6,396
Future Minimum Rental Payments, 2016	6,174
Future Minimum Rental Payments, Future years	10,230
Future Minimum Rental Payments, Total	$ 50,961

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Operating leases future rental and service income.

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Operating leases future rental and service income current.

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Operating leases future rental and service income in five years.

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Operating leases future rental and service income in four years.

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Operating leases future rental and service income in three years.

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Operating leases future rental and service income in two years.

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Operating leases future rental and service income thereafter.

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.