Employee Benefit Plans (Details) |
12 Months Ended | 192 Months Ended | 204 Months Ended | ||
---|---|---|---|---|---|
Dec. 31, 2016
USD ($)
mo
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Dec. 31, 2016
USD ($)
yr
age
|
Dec. 31, 2016
USD ($)
|
|
Employee Benefit Plans [Abstract] | |||||
Eligibility Period For 401K Savings Plan In Months | mo | 3 | ||||
Employer Matching Contribution, Percent of Match | 200.00% | ||||
Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% | ||||
Maximum Eligible Earnings As Established By IRS For Matching Contributions | $ 265,000 | $ 265,000 | $ 260,000 | ||
Employer Contribution Amount | 4,000,000 | 3,700,000 | 3,500,000 | ||
Years Of Service For Supplemental Retirement Contribution | yr | 10 | ||||
Age Of Employee For Supplemental Retirement Contribution | age | 40 | ||||
Annual Supplemental Retirement Contribution And Credit Total. | 21,000 | 42,000 | $ 52,000 | ||
Separate Unrestricted Cash For Deferred Compensation Plan. | 23,800,000 | 20,400,000 | $ 23,800,000 | $ 23,800,000 | |
Deferred Compensation Liability | $ 23,800,000 | $ 20,400,000 | $ 23,800,000 | $ 23,800,000 |