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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
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 4,327us-gaap_ValuationAllowancesAndReservesBalance $ 3,045us-gaap_ValuationAllowancesAndReservesBalance $ 3,588us-gaap_ValuationAllowancesAndReservesBalance
Additions Charged to Costs and Expenses 896us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 1,413us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 745us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Additions Recorded During Acquisitions 0us-gaap_ValuationAllowancesAndReservesAdjustments 0us-gaap_ValuationAllowancesAndReservesAdjustments 0us-gaap_ValuationAllowancesAndReservesAdjustments
Deductions 1,385us-gaap_ValuationAllowancesAndReservesDeductions [1] 130us-gaap_ValuationAllowancesAndReservesDeductions [1] 1,288us-gaap_ValuationAllowancesAndReservesDeductions [1]
Balance at End of Period $ 3,838us-gaap_ValuationAllowancesAndReservesBalance $ 4,327us-gaap_ValuationAllowancesAndReservesBalance $ 3,045us-gaap_ValuationAllowancesAndReservesBalance
[1] Accounts written off, net of recoveries.