STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended								12 Months Ended
	Dec. 31, 2012	Nov. 30, 2012	Sep. 30, 2012	Jul. 31, 2012	Jun. 30, 2012	Apr. 30, 2012	Mar. 31, 2012	Feb. 29, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
STOCKHOLDERS' EQUITY
Common stock outstanding (in shares)	158,160,719								158,160,719	157,320,070	156,955,746
Number of shares of common stock authorized	175,772,173								175,772,173	175,772,173
Common stock issued (in shares)	158,160,719								158,160,719	157,320,070
Number of votes per common share									1
Stock options exercised (in shares)									840,649	364,324	2,728,000
Aggregate consideration of common stock issued									$ 4,616	$ 5,352	$ 42,812
Dividends declared and paid
Dividends declared per share (in dollars per share)		$ 0.13		$ 0.13		$ 0.13		$ 0.13	$ 0.52	$ 0.82	$ 0.51
Dividends paid per share (in dollars per share)	$ 0.13		$ 0.13		$ 0.13		$ 0.13
Dividends declared		20,561		20,561		20,561		20,561
Dividends paid	$ 20,561		$ 20,561		$ 20,561		$ 20,561		$ 82,244	$ 128,930	$ 80,444