The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Equity Compensation - RSU's (Details) - USD ($)	12 Months Ended
Equity Compensation - RSU's (Details) - USD ($)	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Equity Compensation
Award vesting period, in years	3 years
Restricted Stock
Equity Compensation
Weighted Average Grant-Date Fair Value, Granted (in dollars per share)	$ 46.14
Restricted Shares, Granted	414
Restricted Stock Units
Equity Compensation
Restricted Shares, Granted	113,000
Restricted Stock Units \| Minimum
Equity Compensation
Award vesting period, in years	1 year
Restricted Stock Units \| Maximum
Equity Compensation
Award vesting period, in years	3 years
Time based restricted stock
Equity Compensation
Award vesting period, in years	3 years	3 years	3 years
Restricted Shares, Granted	212,000	260,000	73,000
Dividends declared to holders of time-based restricted stock (in dollars)	$ 310,000	$ 185,000	$ 128,000
Dividends declared to holders of time-based restricted stock (in dollars per share)	$ 0.90	$ 0.90	$ 0.85
Performance based restricted stock units
Equity Compensation
Risk-free interest rate (as a percent)	2.50%
Expected volatility (as a percent)	33.90%
Award vesting period, in years	3 years	3 years	3 years
Award expiration period, in years	10 years
Weighted Average Grant-Date Fair Value, Granted (in dollars per share)	$ 44.95
Performance based restricted stock units \| Executive Management
Equity Compensation
Restricted Shares, Granted	89,000	70,000	13,000