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Long-term Equity-based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 36 Months Ended | 0 Months Ended | 36 Months Ended |  | 1 Months Ended | 36 Months Ended
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May 02, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Performance Based Restricted Stock [Member] | Dec. 31, 2013 Options Granted Prior to May 1, 2013 [Domain] | Dec. 31, 2013 Performance Period, 2012 to 2014 [Member] Performance Based Restricted Stock [Member] | Feb. 01, 2014 Performance Period, 2011 to 2013 [Member] Performance Based Restricted Stock [Member] | Dec. 31, 2013 Performance Period, 2011 to 2013 [Member] Performance Based Restricted Stock [Member] | Feb. 02, 2013 Performance Period, 2010 to 2012 [Member] Performance Based Restricted Stock [Member] | Dec. 31, 2012 Performance Period, 2010 to 2012 [Member] Performance Based Restricted Stock [Member] | Dec. 31, 2013 Performance Period, 2013 to 2015 [Member] Performance Based Restricted Stock [Member] | Jan. 31, 2012 Performance Period, 2009 to 2011 [Member] Performance Based Restricted Stock [Member] | Dec. 31, 2011 Performance Period, 2009 to 2011 [Member] Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Awards of Deferred Stock Units to be Issued to each Non-Employee Director | 500 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 8,750,768 |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Share Authorization if Maximum Performance Level is Met or Exceeded |  |  |  |  | 390,486 |  | 179,325 |  |  |  |  | 180,450 |  |
Allocated Share-based Compensation Expense |  | $ 5.5 | $ 5.8 | $ 5.3 |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  | $ 5.4 |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 4 months 24 days |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation,Initial Grant For Non-Employee Director, Shares |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Automatic Annual Grant, Non-Employee Directors, Options |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Automatic Annual Grant, Non-Employee Directors, Options, Vesting Period |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Automatic Annual Grant, Non-Employee Directors, Options, Expiration Date |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Performance Period |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded |  |  |  |  |  |  | 59,775 |  |  |  |  | 60,150 |  |
Payout Percentage for Exceeding Performance Target |  |  |  |  |  |  |  |  | 118.00% |  | 114.00% |  |  | 183.00%
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  |  |  |  |  |  | 9,014 |  | 6,996 |  |  | 40,727 |
Deferred Stock Units Issued | 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value per Deferred Stock Unit Issued | $ 31.50 |  |  |  |  |  |  |  |  |  |  |  |  |

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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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