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Stock Options and Incentive Plans (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Incentive and deferred compensation |  |  |  | $ 4,960,000 | $ 2,087,000 |
Prosperity Plus Savings Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation plan expense |  |  |  | 4,100,000 | 3,800,000 | 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 |  |  |  | 1,600,000 | 1,800,000 | 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 |  |  |  | 3,900,000 |  |
Aggregate intrinsic value of options exercised |  |  |  | 3,100,000 | 200,000 | 300,000
Long Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of stock authorized for payment of awards |  |  |  | 339,050 |  |
Shares issued for long term incentive plan | 40,255 | 6,727 | 32,177 |  |  |
Cash payments in connection with long term incentive plan | 1,100,000 | 200,000 | 800,000 |  |  |
Deferred compensation expense |  |  |  | 2,400,000 | 2,400,000 | 2,400,000
Long Term Incentive Plan [Member] | Management [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 | 34,988 | 27,768 |  |  |  |
Cash payments in connection with long term incentive plan | 2,000,000 | 1,500,000 |  |  |  |
Deferred compensation expense |  |  |  | 3,400,000 | 3,400,000 | 2,700,000
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | 2,500,000 | 1,900,000 | 2,500,000
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
Additional Restricted Stock Plan [Member] | Management [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | 1,000,000 | 400,000 |
Phantom Stock Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | $ 1,500,000 | $ 500,000 |
Vesting period |  |  |  | 5 years |  |

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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 Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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