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Employee Benefit Plans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) officers | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
401(k) Savings Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Minimum age requirement | 21 years |  |
Minimum service period required | 3 months |  |
Employer matching contribution, percent of match | 75.00% |  |
Maximum annual contribution per employee, percent | 8.00% |  |
Total cost recognized for the period | $ 5,200 | $ 4,400 | $ 2,600
Postretirement Life Insurance |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Base amount of death proceeds, annual percentage increase until retirement age is reached | 3.00% |  |
Period death benefit required to be paid within following participant's death | 90 days |  |
Total cost recognized for the period | $ 6,900 | 7,800 | 6,600
Deferred compensation plan | Directors and officers |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Deferred compensation liability | 1,000 | 1,100 |
Deferred compensation plan, period expense | 22 | 21 | 23
Long term incentive plan | Named executive officers ('NEO') |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Deferred compensation plan, period expense | $ 510 | $ 455 | $ 418
Number of officers currently participating in the LTIP | officers | 2 |  |
Long term incentive plan | Named executive officers ('NEO') | Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Deferred compensation plan, requisite service period | 5 years |  |
Long term incentive plan | Named executive officers ('NEO') | Maximum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Deferred compensation plan, requisite service period | 10 years |  |
Vested after 2 Years of Service | 401(k) Savings Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Vesting Percentage | 25.00% |  |
Vested after 3 Years of Service | 401(k) Savings Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Vesting Percentage | 50.00% |  |
Vested after 4 Years of Service | 401(k) Savings Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Vesting Percentage | 75.00% |  |
Vested after 5 or More Years of Service | 401(k) Savings Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Vesting Percentage | 100.00% |  |

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