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Commitments And Contingencies (Narrative) (Details) - USD ($) | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2017 | Apr. 30, 2016 | Jun. 30, 2017 | Aug. 26, 2016 | May 31, 2016
Derivative Litigation And James J. Cotter, Jr. Employment Arbitration [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Amount of damages claimed by plaintiff |  |  | $ 1,200,000 |  |
Coverage limit |  |  | 10,000,000 |  |
The STOMP Arbitration [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Settlement awarded |  | $ 2,300,000 |  |  |
Litigation interest percent |  | 4.00% |  |  |
Litigation payment received |  |  | $ 1,100,000 |  |
Litigation final payment date |  |  | June 2019 |  |
Subsequent Event [Member] | The STOMP Arbitration [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Litigation payment received | $ 427,000 |  |  |  |
Class B [Member] | Derivative Litigation And James J. Cotter, Jr. Employment Arbitration [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Shares held by estate |  |  |  | 100,000 |
Class B [Member] | Cotter Estate [Member] | Derivative Litigation And James J. Cotter, Jr. Employment Arbitration [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Shares held by estate |  |  |  |  | 327,808
Class B [Member] | Cotter Trust [Member] | Derivative Litigation And James J. Cotter, Jr. Employment Arbitration [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Shares held by estate |  |  |  |  | 696,080

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