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Acquisition Charges	9 Months Ended
Acquisition Charges	Sep. 30, 2015
Business Combinations [Abstract]
Acquisition charges	3. Acquisition charges We incurred various costs as a result of the 2011 acquisition of National that are included in Other for segment reporting purposes, consistent with how management measures the performance of its segments. For the three and nine months ended September 30, 2015 and 2014, Acquisition charges were primarily from the ongoing amortization of intangible assets resulting from the National acquisition. See Note 7 for more information.