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Stock Options and Incentive Plans (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation |  |  |  | $ 2,087,000 | $ 2,234,000 |
Prosperity Plus Savings Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation plan expense |  |  |  | 3,800,000 | 3,700,000 | 3,700,000
Maximum percent of annual compensation which the Company can match |  |  |  | 5.00% |  |
Prosperity Plus Savings Plan [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employee contribution, percent |  |  |  | 1.00% |  |
Percent of employee contribution matched by the Company |  |  |  | 50.00% |  |
Prosperity Plus Savings Plan [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employee contribution, percent |  |  |  | 15.00% |  |
Percent of employee contribution matched by the Company |  |  |  | 100.00% |  |
Profit Sharing Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation plan expense |  |  |  | 1,800,000 | 2,300,000 | 2,300,000
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Contractual term of stock options, in years |  |  |  | 20 years |  |
Length of time options are valid after retirement, in years |  |  |  | 10 years |  |
Aggregate intrinsic value of vested options |  |  |  | 1,400,000 |  |
Aggregate intrinsic value of options exercised |  |  |  | 200,000 | 300,000 |
Long Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Earned incentive compensation paid in shares of Class A Common Stock | 40.00% |  |  |  |  |
Shares issued for long term incentive plan | 6,727 | 32,177 | 22,844 |  |  |
Cash payments in connection with long term incentive plan | 200,000 | 800,000 | 1,100,000 |  |  |
Deferred compensation expense |  |  |  | 2,400,000 | 2,400,000 | 1,500,000
Long Term Incentive Plan [Member] | Management [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued for long term incentive plan | 27,768 |  |  |  |  |
Cash payments in connection with long term incentive plan | 1,500,000 |  |  |  |  |
Deferred compensation expense |  |  |  | 3,400,000 | 2,700,000 |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | 1,900,000 | 2,500,000 | 2,800,000
Vesting period |  |  |  | 5 years |  |
Restricted Stock [Member] | Management [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | 500,000 | 1,300,000 | 1,500,000
Additional Restricted Stock Plan [Member] | Management [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | 400,000 |  |
Phantom Stock Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | $ 500,000 |  |
Vesting period |  |  |  | 5 years |  |

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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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