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Benefit Plans - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company contributions |  | $ 0 | $ 0 |  |
Accumulated benefit obligation for the pension plan |  | $ 86,100,000 | $ 92,000,000 |  |
Common share purchased under pension plan, shares |  |  |  |  | 115,800
Common share purchased under pension plan, value |  |  |  |  | $ 7,000,000
Common share purchased under pension plan, value per share |  |  |  |  | $ 60.45
Fair value, pension plan common shares held, shares |  | 115,800 | 115,800 |  |
Fair value of common shares held by pension plan |  | $ 10,500,000 | $ 10,200,000 |  |
Fair value of common shares held by pension plan, per share |  | $ 90.48 | $ 88.48 |  |
Estimated net actuarial (loss) expected to be recognized in the next fiscal year |  | $ (637,000) | $ 0 | $ (2,703,000) |
Expected long-term return on plan assets |  | 7.25% | 7.25% | 7.50% |
Cash balance in bank |  | $ 700,000 |  |  |
Market value of pension plan assets |  | 153,500,000 | $ 160,600,000 |  |
Defined Contribution Plan, Cost Recognized |  | 1,200,000 | $ 1,100,000 | $ 1,100,000 |
Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated prior service costs expected to be recognized in net periodic benefit cost during next fiscal year |  | $ 0 |  |  |
S&P 500 Index |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected long-term rate of return on plan assets |  | 7.25% | 7.25% |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Benefit expense |  | $ 1,100,000 | $ 1,500,000 | $ 0 |
Accrued benefit cost |  | 8,000,000 | 7,600,000 |  |
Level 1 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 135,000,000 | 141,100,000 |  |
Level 2 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | 18,500,000 | 19,500,000 |  |
Level 3 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Equity investments |  | $ 0 | $ 0 |  |
Scenario, Forecast [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated net actuarial (loss) expected to be recognized in the next fiscal year | $ 773,000 |  |  |  |

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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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