Commitments and Contingencies (Details) (USD $)	Dec. 31, 2013
Future minimum lease payments due under operating and capital leases
Operating Leases 2014	$ 14,117,000
Capital Leases 2014	5,392,000	[1]
Operating Leases 2015	14,057,000
Capital Leases 2015	13,157,000	[1]
Operating Leases 2016	14,170,000
Capital Leases 2016	4,732,000	[1]
Operating Leases 2017	14,210,000
Capital Leases 2017	4,732,000	[1]
Operating Leases 2018	14,300,000
Capital Leases 2018	4,679,000	[1]
Operating Leases Thereafter	810,840,000
Capital Leases Thereafter	84,426,000	[1]
Operating Lease Total	881,694,000
Capital Leases Total	$ 117,118,000	[1]

[1] Amounts above represent principal and interest obligations under capital lease arrangements. Related assets with a gross value of $185,244,000 and accumulated depreciation of $13,132,000 are recorded in real property.