Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Common Stock Held in Treasury	Accumulated Other Comprehensive Loss
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)
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. 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)
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting principle	$ (1,105)	$ 0	$ 0	$ (1,105)	$ 0	$ 0