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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans We maintain a 401(k) plan for our eligible employees. We make matching contributions of 50% of the employee salary deferral contributions up to 6% of eligible compensation and may also make annual discretionary contributions. A discretionary contribution was declared at the end of 2018, 2017 and 2016. The total expense recognized for this plan was $1.8 million, $2.0 million and $2.2 million for the years ended December 31, 2018, 2017 and 2016, respectively. We make contributions to a contributory health and welfare plan as necessary to fund claims not covered by employee contributions. The total expense we recognized related to this plan was $3.2 million, $3.4 million and $4.7 million for 2018, 2017 and 2016, respectively. These expense amounts include estimates based upon the historical experience of claims incurred but not reported as of year-end.