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Benefit Plans	12 Months Ended
	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Benefit Plans	(17) Benefit Plans We sponsor a defined contribution plan for the benefit of our employees. The expense associated with this plan was approximately $8.4 million, $7.7 million, and $7.4 million in 2018, 2017, and 2016, respectively.

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- References

No definition available.

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- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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