Condensed Consolidated Statements of Stockholders' Equity (USD $) In Thousands		Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings
Beginning Balance at Dec. 31, 2012		$ 1,052,783	$ 435	$ 748,517	$ (13,855)	$ 317,686
Stock issued for benefit plans		1,622		(1,171)	2,793
Stock options exercised		4		4
Purchase of treasury shares		(1,513)			(1,513)
Tax benefits from stock compensation		(1,607)		(1,607)
Employee stock purchase plan		946	1	945
Issuance of restricted stock			3	(3)
Amortization of share-based compensation		15,557		15,557
Net Income		(2,442)				(2,442)
Ending Balance at Dec. 31, 2013		1,065,350	439	762,242	(12,575)	315,244
Stock issued for benefit plans		1,909		(1,876)	3,785
Purchase of treasury shares		(896)			(896)
Employee stock purchase plan		824	1	823
Issuance of restricted stock			3	(3)
Amortization of share-based compensation		5,689		5,689
Net Income		12,269				12,269
Ending Balance at Jun. 30, 2014	[1]	$ 1,085,145	$ 443	$ 766,875	$ (9,686)	$ 327,513

[1] (1) Unaudited