Retirement And Savings Plan (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
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| Compensation and Retirement Disclosure [Abstract] | |||
| Percentage of employee contribution | 50.00% | ||
| Contribution by employer, per dollar | $ 0.50 | $ 0.50 | |
| Percentage of plan participant's deferrals | 6.00% | 6.00% | |
| Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 5,100,000 | $ 5,000,000 | $ 4,600,000 |
| Cash Surrender Value of Life Insurance | 3,600,000 | 1,900,000 | |
| Deferred Compensation Liability, Current and Noncurrent | $ 3,600,000 | $ 2,000,000 | |
| X | ||||||||||
- Definition Employer Contribution Per Dollar No definition available.
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. No definition available.
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| X | ||||||||||
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. No definition available.
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| X | ||||||||||
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. No definition available.
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| X | ||||||||||
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. No definition available.
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