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Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	(17) Subsequent Events In January 2018, the Company entered into an agreement to amend its corporate headquarters office lease.  The amendment extends the existing lease expiration date from December 2020 to December 2030 and provides for certain tenant allowances and incentives. Before tenant allowances and incentives, the Company’s annual base rent is expected to range from approximately $10.0 million to $13.0 million during the twelve-year lease term.

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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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