BENEFIT PLANS (Details)
|
12 Months Ended |
|
Dec. 31, 2016
USD ($)
employee
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
| 401 (k) plan |
|
|
|
| Minimum percentage of annual eligible compensation by the participants |
1.00%
|
|
|
| Maximum percentage of annual eligible compensation by the participants |
75.00%
|
|
|
| Percentage of employers matching contribution for participant contributions up to 1% |
100.00%
|
|
|
| Percentage of additional employers matching contribution |
75.00%
|
|
|
| Vesting period |
2 years
|
|
|
| Normal and bonus contributions |
|
|
|
| Employer matching contributions |
$ 1,803,000
|
$ 1,517,000
|
$ 1,419,000
|
| Discretionary employer bonus matching contributions |
$ 582,000
|
|
|
| Supplemental Employee Retirement Plan |
|
|
|
| Normal and bonus contributions |
|
|
|
| Number of participants under SERP | employee |
4
|
|
|
| SERP liability incurred |
$ 2,000,000
|
|
|
| Employer matching contributions |
$ 81,000
|
|
|
| Minimum |
|
|
|
| 401 (k) plan |
|
|
|
| Percentage of participant contributions up to which employer matches additional 75% contribution |
2.00%
|
|
|
| Maximum |
|
|
|
| 401 (k) plan |
|
|
|
| Percentage of participant contributions up to which employer matches 100% contribution |
1.00%
|
|
|
| Percentage of participant contributions up to which employer matches additional 75% contribution |
5.00%
|
|
|