Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Equity Attributable to Noncontrolling Interests
Opening Balance, Shares at Jan. 01, 2017		29,774,784
Opening Balance, Value at Jan. 01, 2017	$ 659,776	$ 650,007	$ 234,926	$ (89,063)	$ (148,986)	$ 12,892
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	156,981			151,739		5,242
Accumulated deficit:	39,586				38,834	752
Common shares issued under employee stock purchase plan						(5,613)
Share based compensation expense			11,644
Common shares issued for delivery of share based awards, Shares		372,826
Common shares issued for delivery of share based awards, Value		$ 12,290	(12,290)
Common shares withheld to cover income taxes payable due to delivery of share based awards			(7,466)
Common shares issued under employee stock purchase plan, Shares		16,368
Common shares issued under employee stock purchase plan, Value		$ 1,168	(286)
Common shares repurchased and retired, Shares		(1,794,101)
Common shares repurchased and retired, Value		$ (39,062)		(80,826)
Ending Balance, Shares at Dec. 31, 2017		28,369,877
Ending Balance, Value at Dec. 31, 2017	735,902	$ 624,403	226,528	(18,150)	(110,152)	13,273
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	96,544			92,710		3,834
Accumulated deficit:	$ (43,601)				(42,767)	(834)
Common shares issued under employee stock purchase plan						(4,408)
Share based compensation expense			7,681
Common shares issued for delivery of share based awards, Shares		223,487
Common shares issued for delivery of share based awards, Value		$ 11,375	(11,375)
Common shares withheld to cover income taxes payable due to delivery of share based awards			(3,743)
Common shares issued under employee stock purchase plan, Shares		13,984
Common shares issued under employee stock purchase plan, Value		$ 949	(103)
Common shares repurchased and retired, Shares		(2,771,684)
Common shares repurchased and retired, Value		$ (61,520)		(105,396)
Ending Balance, Shares at Dec. 30, 2018	25,835,664	25,835,664
Ending Balance, Value at Dec. 30, 2018	$ 622,305	$ 575,207	218,988	(30,836)	(152,919)	11,865
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	49,039			44,602		4,437
Accumulated deficit:	$ 23,093				22,750	343
Common shares issued under employee stock purchase plan						(4,665)
Share based compensation expense			10,023
Common shares issued for delivery of share based awards, Shares		186,242
Common shares issued for delivery of share based awards, Value		$ 8,396	(8,396)
Common shares withheld to cover income taxes payable due to delivery of share based awards			(3,852)
Common shares issued under employee stock purchase plan, Shares		18,940
Common shares issued under employee stock purchase plan, Value		$ 1,045	(179)
Common shares repurchased and retired, Shares		(1,170,925)
Common shares repurchased and retired, Value		$ (26,134)		(33,813)
Ending Balance, Shares at Dec. 29, 2019	24,869,921	24,869,921
Ending Balance, Value at Dec. 29, 2019	$ 636,862	$ 558,514	$ 216,584	$ (20,047)	$ (130,169)	$ 11,980