Fair Value Measurements - Recurring Fair Value Measurements Related to Liabilities (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 19, 2018	Dec. 20, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
TSR Performance Based Incentive Plan	$ 0	$ 452
Derivative - Interest Rate Swap, Liability		93
Total liabilities at Fair Value		545
Performance Shares | 2016 Performance Based Incentive Plan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
TSR Performance Based Incentive Plan		400
Performance Shares | 2017 Performance Based Incentive Plan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
TSR Performance Based Incentive Plan	0	100
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
TSR Performance Based Incentive Plan	0	0
Derivative - Interest Rate Swap, Liability		0
Total liabilities at Fair Value		0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
TSR Performance Based Incentive Plan	0	452
Derivative - Interest Rate Swap, Liability		93
Total liabilities at Fair Value		545
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
TSR Performance Based Incentive Plan	$ 0	0
Derivative - Interest Rate Swap, Liability		0
Total liabilities at Fair Value		$ 0