Consolidated Statement of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	COMMON STOCK	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE 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	253,311	0	253,311	0
Other comprehensive loss, net of tax	(975)	0	0	(975)
Common stock dividends (per share $0.06)	(2,797)	0	(2,797)	0
Stock-based compensation	28,799	974	27,825	0
TOTAL EQUITY BALANCE at Jun. 30, 2013	798,653
STOCKHOLDERS' EQUITY BALANCE at Jun. 30, 2013	782,274	46,149	737,008	(883)
NONCONTROLLING INTEREST at Jun. 30, 2013	$ 16,379