Employee Benefit Plans - 401(K) Saving And Retirement Plan (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Employee Benefit Plan Compensation | |||
| Compensation cost | $ 9,000 | $ 7,500 | $ 3,600 |
| Non Employee Director Member | |||
| Employee Benefit Plan Compensation | |||
| Granted (in shares) | 105,479 | 89,490 | 71,311 |
| Compensation cost | $ 267 | $ 267 | $ 331 |
| 401(k) Savings & Retirement Plan | |||
| 401(K) Savings & Retirement Plan | |||
| Percent of salary employee is permitted to contribute | 100.00% | ||
| Vesting period | 3 years | ||
| Common stock, shares issued | 74,863 | ||
| Total expense (including issuance of shares) | $ 1,400 | $ 800 | $ 400 |