Consolidated Statement of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	COMMON STOCK	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
TOTAL EQUITY BALANCE at Dec. 31, 2012	$ 525,760
STOCKHOLDERS' EQUITY BALANCE at Dec. 31, 2012	503,936	45,175	458,669	92
Increase (Decrease) in Stockholders' Equity
Net income	306,960	0	306,960	0
Other comprehensive loss, net of tax	(289)	0	0	(289)
Common stock dividends (per share $0.09)	(4,187)	0	(4,187)	0
Stock-based compensation	30,160	1,010	29,150	0
NONCONTROLLING INTEREST	16,131
TOTAL EQUITY BALANCE at Sep. 30, 2013	852,711
STOCKHOLDERS' EQUITY BALANCE at Sep. 30, 2013	$ 836,580	$ 46,185	$ 790,592	$ (197)