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SEC Schedule II Valuation and Qualifying Accounts (Details) - Allowance For Doubtful Accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation And Qualifying Accounts Disclosure      
Balance at Beginning of Year $ 14,659 $ 21,209 $ 24,719
Additions Charged Against Operations 2,679 (99) 3,076
Uncollectable Accounts Written-Off (4,191) (6,451) (6,586)
Balance at End of Year $ 13,147 $ 14,659 $ 21,209