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Stock Options and Incentive Plans (Narrative) (Details) (USD $) | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2007 | Dec. 31, 2011 Prosperity Plus Savings Plan [Member] | Dec. 31, 2010 Prosperity Plus Savings Plan [Member] | Dec. 31, 2009 Prosperity Plus Savings Plan [Member] | Dec. 31, 2011 Prosperity Plus Savings Plan [Member] Minimum [Member] | Dec. 31, 2011 Prosperity Plus Savings Plan [Member] Maximum [Member] | Dec. 31, 2011 Profit Sharing Plan [Member] | Dec. 31, 2010 Profit Sharing Plan [Member] | Dec. 31, 2009 Profit Sharing Plan [Member] | Mar. 31, 2011 Long Term Incentive Plan [Member] | Mar. 31, 2010 Long Term Incentive Plan [Member] | Dec. 31, 2011 Long Term Incentive Plan [Member] | Dec. 31, 2010 Long Term Incentive Plan [Member] | Dec. 31, 2009 Long Term Incentive Plan [Member] | Dec. 31, 2011 Long Term Incentive Plan [Member] Minimum [Member] | Dec. 31, 2011 Long Term Incentive Plan [Member] Maximum [Member] | Dec. 31, 2011 Restricted Stock [Member] | Dec. 31, 2010 Restricted Stock [Member] | Dec. 31, 2009 Restricted Stock [Member] | Dec. 31, 2011 Additional Restricted Stock Plan [Member] | Dec. 31, 2010 Additional Restricted Stock Plan [Member] | Dec. 31, 2009 Additional Restricted Stock Plan [Member] | Dec. 31, 2011 Deferred Compensation [Member] | Dec. 31, 2010 Deferred Compensation [Member] | Dec. 31, 2009 Deferred Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option expense |  |  | $ 70,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term of stock options, in years | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of time options are valid after retirement, in years | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  | one option for 250,000 shares of Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum market price for options to be exercisable |  |  |  | $ 48.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental vesting percent | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Aggregate intrinsic value of vested options | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercised | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of payout (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 3 years |  |  |  |  |  |  |  |  |
Shares issued for long term incentive plan |  |  |  |  |  |  |  |  |  |  |  |  | 32,177 | 22,844 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments in connection with long term incentive plan |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation plan, cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 | 1,500,000 | 1,600,000 |  |  | 2,500,000 | 2,800,000 | 2,600,000 | 1,300,000 | 1,500,000 | 1,600,000 |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | the vesting period, which includes the year for which performance targets are measured and the two subsequent years. |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation | 1,121,000 | 2,176,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee contribution, percent |  |  |  |  |  |  |  | 1.00% | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of employee contribution matched by the Company |  |  |  |  |  |  |  | 50.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percent of annual compensation which the Company can match |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation, expense |  |  |  |  | $ 3,700,000 | $ 3,700,000 | $ 3,700,000 |  |  | $ 2,300,000 | $ 2,300,000 | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 | $ 200,000 | $ 300,000

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