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401(k) Profit Sharing, Deferred Compensation and Long-term Incentive Plans
12 Months Ended
Dec. 31, 2017
Postemployment Benefits [Abstract]  
401(k) Profit Sharing, Deferred Compensation and Long-Term Incentive Plans
401(k) Profit Sharing, Deferred Compensation and Long-Term Incentive Plans

We have a defined contribution 401(k) plan and trust covering substantially all full-time employees. The annual contribution to the plan is at the discretion of our Board of Directors. Contributions of $5.8 million, $5.4 million, and $5.3 million were recognized for the years ended December 31, 2017, 2016 and 2015, respectively. Employees may contribute to the plan if they meet certain eligibility requirements.

We offer a deferred compensation and long-term incentive plan (the “LTIP”) to provide certain employees the ability to accumulate assets for retirement on a tax deferred basis. We may, depending on position, also make discretionary contributions to the LTIP. These discretionary contributions vest between one and seven years based on the employee’s age. Additionally, a participant may defer a portion of his or her compensation and receive the deferred amount upon certain events, including termination or retirement.

The following is a summary related to our LTIP (in thousands):
Year Ended December 31,
 
2017
 
2016
 
2015
Compensation expense
 
$
1,059

 
$
1,081

 
$
1,812

Total discretionary contribution
 
$
1,730

 
$
1,785

 
$
2,249

Guaranteed annual return
 
5.00
%
 
5.25
%
 
5.25
%


As of December 31, 2017 and 2016, the balance due to participants was $27.9 million and $23.5 million, respectively, and was included as a component of other long-term liabilities in the Consolidated Balance Sheets.