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Employee Benefit Plans (Additional Information) (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| 401(k)/Profit Sharing Plan |
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| Contribution match, as a percentage of annual pay |
4.00% |
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| Contribution matches, percentage of pre-tax compensation |
3.00% |
3.00% |
3.00% |
| Expenses under the 401(K)/Profit Sharing plan |
$ 1,400,000 |
$ 1,400,000 |
$ 1,200,000 |
| Supplemental Executive Retirement Plan [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Minimum guaranteed benefit term |
15 years |
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| Accumulated benefit obligation |
8,500,000 |
8,000,000 |
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| Expected amortization of net actuarial loss |
218,000 |
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| Expected amortization of prior service cost |
19,000 |
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| Supplemental Executive Retirement Plan [Member] | Minimum [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Percentage of income replaced |
65.00% |
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| Supplemental Executive Retirement Plan [Member] | Maximum [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Percentage of income replaced |
75.00% |
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| Other Postretirement Benefit Plan [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Expected amortization of net actuarial loss |
24,000 |
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| Expected amortization of prior service cost |
22,000 |
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| Defined Benefit Plan, Effect of Plan Amendment on Accumulated Benefit Obligation |
$ 308,000 |
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