Consolidated Statement of Changes in Shareholders' Equity - 3 months ended Apr. 01, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock at Cost	Accumulated Other Comprehensive (Loss) Income
Beginning Balance (in shares) at Dec. 31, 2016		67,585,675			25,747,541
Beginning Balance at Dec. 31, 2016	$ 542,557	$ 676	$ 199,414	$ 1,512,993	$ (1,167,437)	$ (3,089)
Net income	32,383			32,383
Dividends ($0.09 per share)	(3,770)			(3,770)
Issuance of stock related to stock-based compensation plans (in shares)		85,663			1,952
Issuance of stock related to stock-based compensation plans	1,378	$ 1	1,540		$ (163)
Stock-based compensation	994		994
Other comprehensive income	201					201
Ending Balance (in shares) at Apr. 01, 2017		67,671,338			25,749,493
Ending Balance at Apr. 01, 2017	$ 573,743	$ 677	$ 201,948	$ 1,541,606	$ (1,167,600)	$ (2,888)