CONSOLIDATED CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Balance at Dec. 31, 2012	$ 1,143,864	$ 47,556	$ 1,002,603	$ 137,279	$ (43,574)
Net income	54,037			54,037
Other comprehensive loss	(682)				(682)
TOTAL COMPREHENSIVE INCOME (LOSS)	53,355
Tax effect of stock-based compensation	(469)		(469)
Stock-based compensation expense	6,597		6,597
Issuance of common stock, net	624	559	65
Balance at Sep. 30, 2013	$ 1,203,971	$ 48,115	$ 1,008,796	$ 191,316	$ (44,256)