CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Items, Net	Noncontrolling Interests
Balance at Dec. 31, 2011	$ 1,254,256	$ 1,721	$ 343,603	$ 902,567	$ (2,203)	$ 8,568
Balance (in shares) at Dec. 31, 2011		172,140,966
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation, including tax benefit of $254 and $2,394 for the six months ended June 30, 2012, and 2013, respectively	23,449	6	23,443
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		597,460
Stock repurchases	(34,688)	(11)	(34,677)
Stock repurchases (in shares)		(1,103,149)
Parent cash dividends declared	(89,161)			(89,161)
Currency translation adjustment	1,102				918	184
Net income (loss)	94,897			93,405		1,492
Noncontrolling interests equity contributions	46					46
Noncontrolling interests dividends	(577)					(577)
Parent purchase of noncontrolling interests	1,000					1,000
Balance at Jun. 30, 2012	1,250,324	1,716	332,369	906,811	(1,285)	10,713
Balance (in shares) at Jun. 30, 2012		171,635,277
Balance at Dec. 31, 2012	1,162,448	1,900	942,199	185,558	20,314	12,477
Balance (in shares) at Dec. 31, 2012	190,005,788	190,005,788
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation, including tax benefit of $254 and $2,394 for the six months ended June 30, 2012, and 2013, respectively	30,907	11	30,896
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		1,103,917
Parent cash dividends declared	(104,544)			(104,544)
Currency translation adjustment	(42,834)				(42,011)	(823)
Net income (loss)	47,974			45,950		2,024
Noncontrolling interests equity contributions	743					743
Noncontrolling interests dividends	(1,155)					(1,155)
Balance at Jun. 30, 2013	$ 1,093,539	$ 1,911	$ 973,095	$ 126,964	$ (21,697)	$ 13,266
Balance (in shares) at Jun. 30, 2013	191,109,705	191,109,705