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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stockholders' Equity - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
Stockholders' Equity - Narrative (Details) - USD ($)	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost, stock options	$ 264,000		$ 264,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted RSAs (in shares)			311,671
Weighted average grant date fair value of RSAs (in dollars per share)			$ 23.61
Recognized expense	940,000	$ 612,000	$ 2,548,000	$ 1,928,000
Total unrecognized compensation cost, RSAs	6,061,000		$ 6,061,000
Weighted average remaining term, RSAs			2 years 31 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized expense	150,000	$ 158,000	$ 451,000	$ 456,000
Weighted average remaining term, stock options			5 months 9 days
Time-Based Vesting \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost, RSAs	3,324,000		$ 3,324,000
Weighted average remaining term, RSAs			1 year 12 months 15 days
Performance-Based Vesting \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost, RSAs	$ 2,737,000		$ 2,737,000
Weighted average remaining term, RSAs			2 years 1 month 25 days
Omnibus Equity Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	243,543		243,543
Share-based compensation expense, capitalized			$ 0
Minimum \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 months
Maximum \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years