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Stock Options and Incentive Plans (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Prosperity Plus Savings Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation plan expense |  |  |  | $ 4.8 | $ 4.3 | $ 4.1
Prosperity Plus Savings Plan [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
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] |  |  |  |  |  |
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 |  |  |  | $ 2.4 | 1.5 | 1.6
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 |  |  |  | $ 1.6 |  |
Aggregate intrinsic value of options exercised |  |  |  | $ 2.0 | 0.7 | 3.1
Long Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of stock authorized for payment of awards |  |  |  | 288,219 |  |
Shares issued for long term incentive plan | 35,393 | 29,321 | 40,255 |  |  |
Cash payments in connection with long term incentive plan | $ 1.2 | $ 1.1 | $ 1.1 |  |  |
Deferred compensation expense |  |  |  | $ 3.0 | 2.4 | 2.4
Vesting period |  |  |  | 3 years |  |
Additional share based compensation expense expected to be recognized in next twelve months |  |  |  | $ 1.5 |  |
Additional share based compensation expense expected to be recognized in two years |  |  |  | 0.6 |  |
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 | 19,571 | 15,910 | 34,988 |  |  |
Cash payments in connection with long term incentive plan | $ 1.5 | $ 1.4 | $ 2.0 |  |  |
Deferred compensation expense |  |  |  | $ 3.4 | 2.7 | 2.3
Long Term Incentive Plan [Member] | Management [Member] | Minimum [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% |  |
Long Term Incentive Plan [Member] | Management [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Earned incentive compensation paid in shares of Class A Common Stock |  |  |  | 50.00% |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | $ 0.6 | 1.4 | 2.5
Vesting period |  |  |  | 5 years |  |
Additional Restricted Stock Plan [Member] | Management [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | $ 0.3 | 0.7 | 1.0
Phantom Stock Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | 2.6 | $ 2.2 | $ 1.5
Compensation cost not yet recognized |  |  |  | $ 6.6 |  |
Vesting period |  |  |  | 5 years |  |
Compensation cost recognition period |  |  |  | 2 years |  |

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