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, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]      
Balance at Beginning of Period $ 6,310us-gaap_ValuationAllowancesAndReservesBalance $ 7,282us-gaap_ValuationAllowancesAndReservesBalance $ 7,277us-gaap_ValuationAllowancesAndReservesBalance
Charged to Costs and Expenses 1,741us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 1,074us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 2,123us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Deductions 2,487us-gaap_ValuationAllowancesAndReservesDeductions 2,046us-gaap_ValuationAllowancesAndReservesDeductions 2,118us-gaap_ValuationAllowancesAndReservesDeductions
Balance at End of Period $ 5,564us-gaap_ValuationAllowancesAndReservesBalance $ 6,310us-gaap_ValuationAllowancesAndReservesBalance $ 7,282us-gaap_ValuationAllowancesAndReservesBalance