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Employee Benefit Plans - Narrative (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) Retiree shares | Dec. 31, 2015 USD ($) Retiree shares | Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Liabilities, including the Company's common stock | $ 24,169,000 | $ 22,371,000 |
Defined contribution cost recognized | $ 1,800,000 | $ (6,400,000) | $ (4,900,000)
Postretirement Benefits Other than Pensions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of retirees and dependents | Retiree | 310 | 276 |
Subsidy limit percentage of expected annual fully insured premium over age threshold | 60.00% |  |
Subsidy limit percentage of expected annual fully insured premium under age threshold | $ 648,000 |  |
Annual subsidy limit percentage increases for fully insured premium over age threshold | 3.50% |  |
Estimated contributions in 2016 | $ 1,200,000 |  |
Savings Investment Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching percent | 6.00% |  |
Maximum contribution, percent of employee salary | 9.00% |  |
Plan contributions charged to expense | $ 6,500,000 | $ 7,100,000 | 7,200,000
Deferred compensation plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Market value of the trust assets, excluding the Company's common stock | 12,600,000 | 12,900,000 |
Liabilities, including the Company's common stock | $ 24,200,000 | $ 22,400,000 |
Number of common stock deferred into the rabbi trust (in shares) | shares | 495,774 | 534,174 |
Company's common stock held in the rabbi trust | $ 5,100,000 | $ 5,700,000 |
Company contributions to deferred compensation plan | $ 600,000 | $ 1,000,000 | $ 800,000

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- Definition Represents the number of retired employees, including their spouses, eligible dependents and surviving spouses (retirees), to whom Company provides benefits under the plan. + References No definition available. + Details
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- Definition Represents the entity's subsidy which is limited to the percentage of the expected annual fully-insured premium. + References No definition available. + Details
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- Definition Represents the plan contributions that are charged to expense. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Aggregate value of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19850-108362 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19833-108362 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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