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Schedule II - Valuation and Qualifying Accounts (Details) - Allowance Accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Valuation Allowances and Reserves      
Balance at the beginning of the year $ 51,377 $ 49,169 $ 48,599
Additions      
Amounts Charged Against Operations, net 820,097 5,413 2,633
Deductions      
Uncollectible Accounts Written-off (17,209) (2,512) (2,063)
Disposed Properties (316) (693)  
Balance at the end of the year $ 853,949 $ 51,377 $ 49,169