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Incentive, Retirement and Deferred Compensation Plans - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 3 Months Ended |  | 12 Months Ended
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Jul. 31, 2013 Performance Units | Dec. 31, 2013 Performance Units | Dec. 31, 2013 Performance Units Minimum | Dec. 31, 2013 Performance Units Maximum | Sep. 30, 2013 Final Payments Under Existing Cash Bonus Program | Dec. 31, 2013 Management Annual Incentive Plan Minimum | Dec. 31, 2013 Management Annual Incentive Plan Maximum | Dec. 31, 2013 Annual Incentive Plan | Dec. 31, 2013 Retirement Plan | Dec. 31, 2012 Retirement Plan | Dec. 31, 2011 Retirement Plan | Dec. 31, 2013 Retirement Plan Maximum | Dec. 31, 2013 Deferred Compensation Plan | Dec. 31, 2012 Deferred Compensation Plan | Dec. 31, 2011 Deferred Compensation Plan | Dec. 31, 2013 Deferred Compensation Plan Maximum
Employee Compensation Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to employees |  |  |  |  | $ 10.9 |  |  |  |  |  |  |  |  |  |  |
Incentive plans, payout percentages of target values |  |  | 50.00% | 200.00% |  | 0.00% | 200.00% |  |  |  |  |  |  |  |  |
Accrued bonuses |  |  |  |  |  |  |  | 30.2 |  |  |  |  |  |  |  |
Award, grants in period | 31,142 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award, accrued liability |  | 1.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  | 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation, capitalized |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance units, vested in period |  | 12,178 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of awards vested during the period |  | 1.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance units, forfeited in period |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested awards |  | 1.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested awards, weighted average period of recognition |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement plan, employer matching contribution, percent of match |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00% |  |  |  |  |
Retirement plan, employer matching contribution, percent of employees' gross pay |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |
Retirement plan, cost recognized |  |  |  |  |  |  |  |  | 11.0 | 11.4 | 7.4 |  |  |  |  |
Deferred compensation plan, employer match percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00%
Deferred compensation plan, compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.7 | $ 3.5 | $ 3.1 |

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- Definition Incentive plan payout percentages of target values based on performance above a minimum threshold + References No definition available. + Details
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- Definition Amount of liabilities accrued for share-based compensation as of the reporting date. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Commitment made to pay deferred cash remuneration expressed as a percentage of the individual's base salary. + References No definition available. + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + 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=6414718&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Payments of cash to employees, including wages and salaries, during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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