CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock
Balance at Dec. 31, 2013	$ 577,353	$ 906	$ 602,469	$ 989,451	$ (1,015,473)
Balance (in shares) at Dec. 31, 2013		90,632
Increase (Decrease) in Stockholders' Equity
Net income	22,518			22,518
Cash dividends declared	(7,196)			(7,196)
Issuance of common stock from stock options exercised	5,899	3	5,896
Issuance of common stock from stock options exercised (in shares)		311
Tax impact of stock options exercised, net of cancellations	3,942		3,942
Stock-based compensation	3,886		3,886
Issuance of restricted stock, net of forfeitures	1	1
Issuance of restricted stock, net of forfeitures (in shares)		59
Treasury stock purchases	(98,981)				(98,981)
Payment for future treasury stock purchases under accelerated stock repurchase agreement	(4,904)		(4,904)
Balance at Apr. 01, 2014	$ 502,518	$ 910	$ 611,289	$ 1,004,773	$ (1,114,454)
Balance (in shares) at Apr. 01, 2014		91,002