Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policy Deferred Gains (Details)

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Basis of Presentation and Accounting Policy Deferred Gains (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Deferred Gains $ 146,076 $ 155,397 $ 159,911 $ 124,763
Sales Leaseback and Financed Equipment Sales [Member]        
Deferred Gains on Asset Sales 2,035 40,445    
Amortization Of Deferred Gains Included in Operating Expenses As A Reduction To Rental Expense 11,273 7,155    
Amortization Of Deferred Gains Included In Gains On Asset Dispositions And Impairments, Net $ 4,597 $ 2,656