Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Common Stock Held in Treasury	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting principle	$ (70,210)	$ 0	$ 0	$ (70,210)	$ 0	$ 0
Stockholders' Equity, beginning of period at Dec. 31, 2017	573,203	47,042	2,885,955	(163,289)	(2,150,307)	(46,198)
Increase (Decrease) in Stockholders' Equity
Net income	20,159	0	0	20,159	0	0
Other comprehensive (loss) income, net	(5,927)	0	0	0	0	(5,927)
Cash Dividends	(20,355)	0	0	(20,355)	0	0
Repurchases of common stock	(39,407)	0	0	0	(39,407)	0
Share-based compensation	4,458	0	4,458	0	0	0
Common stock issued upon exercises of stock options	3,578	0	(7,460)	0	11,038	0
Common stock issued upon vesting of restricted shares	(2,550)	0	(4,170)	0	1,620	0
Other	48	0	21	(5)	32	0
Stockholders' Equity, end of period at Apr. 01, 2018	462,997	47,042	2,878,804	(233,700)	(2,177,024)	(52,125)
Stockholders' Equity, beginning of period at Dec. 31, 2017	573,203	47,042	2,885,955	(163,289)	(2,150,307)	(46,198)
Increase (Decrease) in Stockholders' Equity
Net income	441,284
Other comprehensive (loss) income, net	(4,937)
Stockholders' Equity, end of period at Sep. 30, 2018	783,318	47,042	2,883,298	146,983	(2,242,870)	(51,135)
Stockholders' Equity, beginning of period at Apr. 01, 2018	462,997	47,042	2,878,804	(233,700)	(2,177,024)	(52,125)
Increase (Decrease) in Stockholders' Equity
Net income	29,876	0	0	29,876	0	0
Other comprehensive (loss) income, net	(4,325)	0	0	0	0	(4,325)
Cash Dividends	(20,290)	0	0	(20,290)	0	0
Repurchases of common stock	(45,787)	0	0	0	(45,787)	0
Share-based compensation	5,133	0	5,133	0	0	0
Common stock issued upon exercises of stock options	3,236	0	396	0	2,840	0
Common stock issued upon vesting of restricted shares	(371)	0	(1,199)	0	828	0
Other	70	0	33	(6)	43	0
Stockholders' Equity, end of period at Jul. 01, 2018	430,539	47,042	2,883,167	(224,120)	(2,219,100)	(56,450)
Increase (Decrease) in Stockholders' Equity
Net income	391,249	0	0	391,249	0	0
Other comprehensive (loss) income, net	5,315	0	0	0	0	5,315
Cash Dividends	(20,141)	0	0	(20,141)	0	0
Repurchases of common stock	(56,421)	0	0	0	(56,421)	0
Share-based compensation	4,810	0	4,810	0	0	0
Common stock issued upon exercises of stock options	29,075	0	(2,409)	0	31,484	0
Common stock issued upon vesting of restricted shares	(1,168)	0	(2,300)	0	1,132	0
Other	60	0	30	(5)	35	0
Stockholders' Equity, end of period at Sep. 30, 2018	783,318	47,042	2,883,298	146,983	(2,242,870)	(51,135)
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting principle	(1,105)	0	0	(1,105)	0	0
Stockholders' Equity, beginning of period at Dec. 30, 2018	648,449	47,042	2,884,696	146,277	(2,367,893)	(61,673)
Increase (Decrease) in Stockholders' Equity
Net income	31,894	0	0	31,894	0	0
Other comprehensive (loss) income, net	6,025	0	0	0	0	6,025
Cash Dividends	(23,069)	0	0	(23,069)	0	0
Repurchases of common stock	(29,370)	0	0	0	(29,370)	0
Share-based compensation	5,022	0	5,022	0	0	0
Common stock issued upon exercises of stock options	8,848	0	(205)	0	9,053	0
Common stock issued upon vesting of restricted shares	(6,055)	0	(8,874)	0	2,819	0
Other	55	0	24	(6)	37	0
Stockholders' Equity, end of period at Mar. 31, 2019	640,694	47,042	2,880,663	153,991	(2,385,354)	(55,648)
Stockholders' Equity, beginning of period at Dec. 30, 2018	648,449	47,042	2,884,696	146,277	(2,367,893)	(61,673)
Increase (Decrease) in Stockholders' Equity
Net income	110,407
Other comprehensive (loss) income, net	7,563
Stockholders' Equity, end of period at Sep. 29, 2019	649,591	47,042	2,885,404	186,282	(2,415,027)	(54,110)
Stockholders' Equity, beginning of period at Mar. 31, 2019	640,694	47,042	2,880,663	153,991	(2,385,354)	(55,648)
Increase (Decrease) in Stockholders' Equity
Net income	32,386	0	0	32,386	0	0
Other comprehensive (loss) income, net	3,835	0	0	0	0	3,835
Cash Dividends	(23,124)	0	0	(23,124)	0	0
Repurchases of common stock	(20,391)	0	0	0	(20,391)	0
Share-based compensation	4,986	0	4,986	0	0	0
Common stock issued upon exercises of stock options	10,491	0	(339)	0	10,830	0
Common stock issued upon vesting of restricted shares	(888)	0	(1,852)	0	964	0
Other	59	0	26	(4)	37	0
Stockholders' Equity, end of period at Jun. 30, 2019	648,048	47,042	2,883,484	163,249	(2,393,914)	(51,813)
Increase (Decrease) in Stockholders' Equity
Net income	46,127	0	0	46,127	0	0
Other comprehensive (loss) income, net	(2,297)	0	0	0	0	(2,297)
Cash Dividends	(23,087)	0	0	(23,087)	0	0
Repurchases of common stock	(26,462)	0	0	0	(26,462)	0
Share-based compensation	3,981	0	3,981	0	0	0
Common stock issued upon exercises of stock options	4,716	0	545	0	4,171	0
Common stock issued upon vesting of restricted shares	(1,489)	0	(2,636)	0	1,147	0
Other	54	0	30	(7)	31	0
Stockholders' Equity, end of period at Sep. 29, 2019	$ 649,591	$ 47,042	$ 2,885,404	$ 186,282	$ (2,415,027)	$ (54,110)