Commitments and Contingencies (Details) - Future minimum capital lease payments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future minimum payments on capital leases:
2013	$ 11,927
2014	12,226
2015	12,531
2016	12,845
2017	13,166
2018 - 2028	159,720
Total minimum future lease payments	$ 222,415

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Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing.

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Amount of minimum lease payments maturing after the fifth fiscal year following the latest fiscal year for sale-leaseback transactions accounted for using the deposit method or as a financing.

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Amount of minimum lease payments maturing in the fifth fiscal year following the latest fiscal year for sale-leaseback transactions accounted for using the deposit method or as a financing.

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Amount of minimum lease payments maturing in the fourth fiscal year following the latest fiscal year for sale-leaseback transactions accounted for using the deposit method or as a financing.

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Amount of minimum lease payments maturing in the next fiscal year following the latest fiscal year for sale-leaseback transactions accounted for using the deposit method or as a financing.

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Amount of minimum lease payments maturing in the third fiscal year following the latest fiscal year for sale-leaseback transactions accounted for using the deposit method or as a financing.

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- Definition

Amount of minimum lease payments maturing in the second fiscal year following the latest fiscal year for sale-leaseback transactions accounted for using the deposit method or as a financing.

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