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Retirement Benefits
12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Retirement Benefits Disclosure
RETIREMENT BENEFITS
Our employees are eligible to participate in a 401(k) savings plan. Employees are eligible to participate after completing 90 days of service and having attained the age of 21. Salary deferrals are allowed in amounts up to 100% of an eligible employee’s salary, not to exceed the maximum allowed by law. A discretionary match may be made by us of up to 100% of the first 4% of an eligible employee’s deferral, not to exceed the maximum allowed by law. For each of the years ended December 31, 2018, 2017 and 2016, our matching contributions were $2.6 million, $1.8 million and $0.8 million, respectively.