Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Operating Leases, Future Minimum Payments Receivable [Abstract]
Operating Leases, Future Minimum Payments Receivable, Current	$ 471,918
Operating Leases, Future Minimum Payments Receivable, in Two Years	457,315
Operating Leases, Future Minimum Payments Receivable, in Three Years	416,467
Operating Leases, Future Minimum Payments Receivable, in Four Years	358,368
Operating Leases, Future Minimum Payments Receivable, in Five Years	299,619
Operating Leases, Future Minimum Payments Receivable, Thereafter	$ 1,403,003