Transactions with Officers and Directors (Details) - Chief Executive Officer |
12 Months Ended |
|---|---|
|
Dec. 31, 2017
USD ($)
| |
| Employment agreement term | 5 years |
| Officers' Compensation | $ 960,750 |
| Annual base salary increase | 5.00% |
| Annual target cash bonus | 250.00% |
| Termination Benefits Scenario Without Cause or Good Reason [Member] | |
| Severance payment multiple | 1.5 |
| Pro rated severance payment | $ 11,750,000 |
| Fixed severance payments | $ 17,500,000 |
| Additional vesting added upon termination | 18 months |
| Termination Benefits Scenario With No Good Reason [Member] | |
| Fixed severance payments | $ 11,750,000 |
| Termination Benefits Scenario For Death Or Disability [Member] | |
| Severance payment multiple | 1.5 |
| Pro rated severance payment | $ 11,750,000 |
| Fixed severance payments | 17,500,000 |
| Performance Options And Performance Based Restricted Stock Units [Member] | Common Class B | |
| Target Allocation [Abstract] | |
| 2015 | 16,000,000 |
| 2016 | 17,000,000 |
| 2017 | 18,000,000 |
| 2018 | 19,000,000 |
| 2019 | $ 20,000,000 |