Earnings per Unit (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 25, 2018
Earnings Per Unit [Abstract]
Basic weighted average units outstanding (in shares)	56,310	56,150
Diluted weighted average units outstanding (in shares)	56,310	56,150
Net income (loss) per limited partner unit - basic (in dollars per share)	$ (1.49)	$ (1.49)
Net income (loss) per limited partner unit - diluted (in dollars per share)	$ (1.49)	$ (1.49)