Summary of Significant Accounting Policies - Concentrations (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Concentration Risk [Line Items] | ||||
| Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants | 46.30% | 46.30% | ||
| Impairment of property and equipment | $ 0 | $ 0 | $ 1,417 | $ 0 |
| Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants Before Expiration | 14.40% | 14.40% | ||
| Customer concentration risk | Consolidated net revenues | ||||
| Concentration Risk [Line Items] | ||||
| Percentage of Consolidated Net Revenues | 19.00% | 20.60% | 18.70% | 19.80% |
| Customer concentration risk | Consolidated net revenues | Sweet Baked Goods | ||||
| Concentration Risk [Line Items] | ||||
| Percentage of Consolidated Net Revenues | 18.40% | 19.90% | 18.10% | 19.10% |
| Customer concentration risk | Consolidated net revenues | In-Store Bakery | ||||
| Concentration Risk [Line Items] | ||||
| Percentage of Consolidated Net Revenues | 0.60% | 0.70% | 0.60% | 0.70% |