Note Purchase and Private Shelf Agreement	9 Months Ended
Note Purchase and Private Shelf Agreement	Sep. 30, 2014
Debt Disclosure [Abstract]
Note Purchase and Private Shelf Agreement	NOTE 6. NOTE PURCHASE AND PRIVATE SHELF AGREEMENT On March 17, 2014, the Company entered into an Amendment to the Note Purchase and Private Shelf Agreement (“Amendment”) with Prudential Investment Management, Inc. (“PIM”), The Prudential Insurance Company of America and Prudential Retirement Insurance and Annuity Company (collectively with PIM, the “Purchasers”). The Amendment amended certain terms of the Note Purchase and Private Shelf Agreement, dated April 21, 2011 between the Company and the Purchasers (the “Agreement”). Pursuant to the Amendment, among other things, the issuance period for the senior notes (the “Shelf Notes”) to be issued and sold pursuant to the Agreement is extended until the earlier of March 17, 2017 or the termination of the issuance and sale of the Shelf Notes upon the 30 days’ prior notice of either PIM or the Company. On March 17, 2014, the Company also issued and sold to the Purchasers a $40.0 million aggregate principal amount of its 3.68% Series B Senior Notes (the “Notes”) pursuant to the terms of the Agreement, as amended. The Notes are an unsecured obligation of the Company. The Notes bear interest at a rate of 3.68% per annum and mature on March 17, 2021. Interest on the Notes is payable semi-annually beginning on September 17, 2014 and continuing thereafter on March 17 and September 17 of each year until maturity. The full net proceeds from the Notes will be used for working capital and other general corporate purposes.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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