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Stock Options and Incentive Plans (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 |  |  |  | $ 0.8 |  |
Aggregate intrinsic value of options exercised |  |  |  | $ 0.5 | $ 1.1 | $ 0.5
Long Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of stock authorized for payment of awards |  |  |  | 1,146,440 |  |
Shares issued for long term incentive plan | 33,425 | 25,899 | 26,146 |  |  |
Cash payments in connection with long term incentive plan | $ 1.3 | $ 1.0 | $ 0.8 |  |  |
Deferred compensation expense |  |  |  | $ 0.8 | 2.6 | 2.7
Vesting period |  |  |  | 3 years |  |
Additional share based compensation expense expected to be recognized in next twelve months |  |  |  | $ 0.2 |  |
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 | 10,751 | 18,784 | 26,774 |  |  |
Cash payments in connection with long term incentive plan | $ 1.4 | $ 1.9 | $ 1.9 |  |  |
Deferred compensation expense |  |  |  | 3.4 | 2.6 | 3.3
Additional share based compensation expense expected to be recognized in next twelve months |  |  |  | 0.8 |  |
Additional share based compensation expense expected to be recognized in two years |  |  |  | 0.3 |  |
Phantom Stock Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | 4.8 | 4.9 | 3.8
Compensation cost not yet recognized |  |  |  | $ 9.6 |  |
Vesting period |  |  |  | 5 years |  |
Compensation cost recognition period |  |  |  | 2 years |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | $ 0.5 |  |
Compensation cost not yet recognized |  |  |  | $ 1.8 |  |
Minimum [Member] | 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% |  |
Maximum [Member] | 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 |  |  |  | 50.00% |  |
Pension Plans [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation plan expense |  |  |  | $ 6.3 | 5.9 | 5.5
Pension Plans [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percent of employee contribution matched by the Company |  |  |  | 50.00% |  |
Pension Plans [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 |  |  |  | $ 3.2 | $ 2.6 | $ 2.9

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