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Operating Leases - Lessor (Details) (USD $)
12 Months Ended
Dec. 31, 2013
employees
Operating Leases, Future Minimum Payments Receivable [Abstract]  
2013 $ 344,464,000
2014 324,227,000
2015 288,315,000
2016 244,639,000
2017 198,298,000
Thereafter 1,013,349,000
Total $ 2,413,292,000
Customer Concentration Risk - Number 0
Concentration Risk, Percentage 5.00%