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 $309 and $2,499 for the nine months ended September 30, 2012, and 2013, respectively	45,164	11	45,153
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		1,095,330
Stock repurchases	(34,688)	(11)	(34,677)
Stock repurchases (in shares)		(1,103,149)
Parent cash dividends declared	(135,642)			(135,642)
Currency translation adjustment	21,197				20,473	724
Net income (loss)	148,648			146,214		2,434
Noncontrolling interests equity contributions	336					336
Noncontrolling interests dividends	(1,146)					(1,146)
Parent purchase of noncontrolling interests	1,000					1,000
Balance at Sep. 30, 2012	1,299,125	1,721	354,079	913,139	18,270	11,916
Balance (in shares) at Sep. 30, 2012		172,133,147
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 $309 and $2,499 for the nine months ended September 30, 2012, and 2013, respectively	40,256	12	40,244
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		1,207,072
Parent cash dividends declared	(156,693)			(156,693)
Currency translation adjustment	(25,811)				(24,811)	(1,000)
Net income (loss)	52,931			49,997		2,934
Noncontrolling interests equity contributions	743					743
Noncontrolling interests dividends	(1,708)					(1,708)
Balance at Sep. 30, 2013	$ 1,072,166	$ 1,912	$ 982,443	$ 78,862	$ (4,497)	$ 13,446
Balance (in shares) at Sep. 30, 2013	191,212,860	191,212,860