Stockholders' Equity - Cash Dividend (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Feb. 17, 2017	Feb. 06, 2017	Jan. 26, 2017	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014	Feb. 14, 2017
Cash Dividend
Dividends paid				$ 27,896	$ 24,844	$ 21,735
Quarterly dividend, date of record		Feb. 06, 2017
Quarterly dividend, date of distribution	Feb. 17, 2017
Quarterly dividend declared, per share (in dollars per share)							$ 0.20
Quarterly dividend declared							$ 7,400
Quarterly dividend, date of declaration			Jan. 26, 2017