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Schedule II - Valuation And Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at January 1, $ 4,456 $ 4,576 $ 5,835
Charged (Credited) to Expense 0 0 0
Deductions (2,493) (120) (1,259)
Balance at December 31, $ 1,963 $ 4,456 $ 4,576