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Schedule II - Valuation and Qualifying Accounts (Details) - Allowance Accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves      
Balance at the beginning of the year $ 198,216 $ 846 $ 1,034
Additions      
Amounts Charged Against Operations, net 253 197,487  
Deductions      
Uncollectible Accounts Written-off (188) (117) (188)
Disposed Properties (2,232)    
Balance at the end of the year $ 196,049 $ 198,216 $ 846