Employee Benefit Plans - 401(K) Saving And Retirement Plan (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Employee Benefit Plan Compensation | |||
| Compensation cost | $ 7,400 | $ 9,000 | $ 9,000 |
| Non Employee Director | |||
| Employee Benefit Plan Compensation | |||
| Granted (in shares) | 107,389 | 148,077 | 105,479 |
| Compensation cost | $ 261 | $ 276 | $ 267 |
| Savings And Retirement Plan 401 K | |||
| 401(K) Savings & Retirement Plan | |||
| Percent of salary employee is permitted to contribute | 100.00% | ||
| Vesting period | 3 years | ||
| Common stock, shares issued | 633,827 | ||
| Total expense (including issuance of shares) | $ 1,800 | $ 1,600 | $ 1,400 |