Defined Contribution Plan (Details) - USD ($) $ in Thousands |
12 Months Ended | |||
---|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2006 |
|
Defined Contribution Plan [Abstract] | ||||
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 862 | $ 682 | $ 565 | |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 90.00% | 15.00% |