Annual report pursuant to Section 13 and 15(d)

Schedule II: Valuation And Qualifying Accounts (Details)

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Schedule II: Valuation And Qualifying Accounts (Details) - 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 Beginning of Period $ 3,972 $ 3,151 $ 5,043
Additions Charged to Expense 0 821 0
Deductions (266) 0 (1,892)
Balance at End of Period 3,706 3,972 3,151
Allowance for Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 4,686 4,324 2,962
Additions Charged to Expense 1,123 1,496 1,221
Deductions (1,627) (1,134) 141
Balance at End of Period $ 4,182 $ 4,686 $ 4,324