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Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Subsequent to quarter end, on April 20, 2018, the Corporation entered into a Third Amended and Restated Credit Agreement. This amendment to the credit agreement extends the maturity of the facility to April 20, 2023, with the option for two additional one-year extensions, and increases the maximum borrowing capacity to $450 million. All other terms and conditions of the agreement were substantially unchanged.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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