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Other Income, Net	12 Months Ended
Other Income, Net	Dec. 31, 2017
Other Income, Net [Abstract]
Other Income, Net	7. Other Income, Net On May 31, 2017, the Company entered into a settlement agreement with Merrill Lynch, Pierce, Fenner & Smith Incorporated (“Merrill Lynch”), as successor in interest to Banc of America Securities LLC and Bank of America, N.A. (collectively “BofA”), to resolve the pending litigation between the Company and Merrill Lynch. The litigation, which was filed by the Company in 2011, related to the purchase by the Company of certain auction-rate securities from BofA. On June 6, 2017, the Company received the $37.0 million cash settlement payment agreed to in the settlement agreement, and the pending litigation was dismissed with prejudice. Neither party made any admission of liability or wrongdoing, and the settlement agreement includes mutual releases of all claims and liabilities related to the subject matter of the pending litigation. The Company recognized the settlement as a gain during the second quarter of 2017 and reported it as a component of other income, net in its Consolidated Statement of Income for the year ended December 31, 2017.