Benefit Plans (Details) - USD ($) $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Apr. 28, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Maximum percentage of pretax earnings employee is eligible to contribute under defined contribution plan | 15.00% | |||
| 401(k) defined contribution plan expense | $ 0.9 | $ 0.6 | $ 0.3 | |
| Long-Term Incentive Plan [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Incentive plan period | 10 years | |||
| Long-Term Incentive Plan [Member] | Common Class B [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Number of shares authorized under incentive plan (in shares) | 1,250,000 | |||
| Long-Term Incentive Plan [Member] | Common Class B [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Number of shares available for grant | 200,000 | |||