Subsequent Events	9 Months Ended
Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events On October 1, 2019, the Company entered into a note purchase agreement with certain institutional investors relating to the private placement of $15,000 aggregate principal amount of the Company’s senior notes. The senior notes bear interest at 3.23% per annum payable semiannually and mature on October 1, 2040. The senior notes are unsecured and unsubordinated obligations of the Company. The Company received net proceeds, after deducting issuance costs, of approximately $14,888. The net proceeds were used to refinance the $15,000 aggregate principal amount of the Company’s 5.00% Monthly Senior Notes Series 2010A due October 1, 2040. On October 8, 2019, the Pennsylvania Economic Development Financing Authority, or PEDFA, issued and sold $10,500 aggregate principal amount of PEDFA Exempt Facilities Revenue Refunding Bonds, Series A of 2019, or the Series A Bonds, and $14,870 aggregate principal amount of PEDFA Exempt Facilities Revenue Refunding Bonds, Series B of 2019, or the Series B Bonds, for the Company's benefit pursuant to the terms of a trust indenture, dated as of September 1, 2019, between the PEDFA and Manufacturers and Traders Trust Company, as trustee. The PEDFA then loaned the proceeds of the issuance and sale of the Series A and the Series B Bonds to the Company pursuant to a loan agreement dated as of September 1, 2019, between the Company and the PEDFA. The Series A Bonds, and therefore the loan, bears interest at 3.00% per annum payable semiannually and the maturity date of the loan is October 1, 2036 subject to optional and mandatory redemption provisions. The Series B Bonds, and therefore the loan, bears interest at 3.10% per annum payable semiannually and the maturity date of the loan is November 1, 2038 subject to optional and mandatory redemption provisions. Amounts outstanding under the loan agreement are direct, unsecured and unsubordinated obligations of the Company. The Company received net proceeds, after deducting issuance costs, of approximately $25,049. The net proceeds were used to refinance the $10,500 aggregate principal amount of the Company’s 4.75% York County Industrial Development Authority Revenue Bonds Series 2006 due October 1, 2036 and the $14,870 aggregate principal amount of the Company’s 4.50% PEDFA Exempt Facilities Revenue Refunding Bonds Series 2014 due November 1, 2038.

14. Subsequent Events

On October 1, 2019, the Company entered into a note purchase agreement with certain institutional investors relating to the private placement of $15,000 aggregate principal amount of the Company’s senior notes. The senior notes bear interest at 3.23% per annum payable semiannually and mature on October 1, 2040. The senior notes are unsecured and unsubordinated obligations of the Company. The Company received net proceeds, after deducting issuance costs, of approximately $14,888. The net proceeds were used to refinance the $15,000 aggregate principal amount of the Company’s 5.00% Monthly Senior Notes Series 2010A due October 1, 2040.

On October 8, 2019, the Pennsylvania Economic Development Financing Authority, or PEDFA, issued and sold $10,500 aggregate principal amount of PEDFA Exempt Facilities Revenue Refunding Bonds, Series A of 2019, or the Series A Bonds, and $14,870 aggregate principal amount of PEDFA Exempt Facilities Revenue Refunding Bonds, Series B of 2019, or the Series B Bonds, for the Company's benefit pursuant to the terms of a trust indenture, dated as of September 1, 2019, between the PEDFA and Manufacturers and Traders Trust Company, as trustee. The PEDFA then loaned the proceeds of the issuance and sale of the Series A and the Series B Bonds to the Company pursuant to a loan agreement dated as of September 1, 2019, between the Company and the PEDFA. The Series A Bonds, and therefore the loan, bears interest at 3.00% per annum payable semiannually and the maturity date of the loan is October 1, 2036 subject to optional and mandatory redemption provisions. The Series B Bonds, and therefore the loan, bears interest at 3.10% per annum payable semiannually and the maturity date of the loan is November 1, 2038 subject to optional and mandatory redemption provisions. Amounts outstanding under the loan agreement are direct, unsecured and unsubordinated obligations of the Company. The Company received net proceeds, after deducting issuance costs, of approximately $25,049. The net proceeds were used to refinance the $10,500 aggregate principal amount of the Company’s 4.75% York County Industrial Development Authority Revenue Bonds Series 2006 due October 1, 2036 and the $14,870 aggregate principal amount of the Company’s 4.50% PEDFA Exempt Facilities Revenue Refunding Bonds Series 2014 due November 1, 2038.