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 $190 and $1,705 for the three months ended March 31, 2012, and 2013, respectively	8,568	2	8,566
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		144,581
Stock repurchases	(34,688)	(11)	(34,677)
Stock repurchases (in shares)		(1,103,149)
Parent cash dividends declared	(42,791)			(42,791)
Currency translation adjustment	27,947				27,489	458
Net income (loss)	55,980			55,350		630
Noncontrolling interests equity contributions	39					39
Noncontrolling interests dividends	(508)					(508)
Balance at Mar. 31, 2012	1,268,803	1,712	317,492	915,126	25,286	9,187
Balance (in shares) at Mar. 31, 2012		171,182,398
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 $190 and $1,705 for the three months ended March 31, 2012, and 2013, respectively	12,608	6	12,602
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		606,077
Parent cash dividends declared	(52,448)			(52,448)
Currency translation adjustment	(14,947)				(14,962)	15
Net income (loss)	20,534			19,386		1,148
Noncontrolling interests equity contributions	464					464
Noncontrolling interests dividends	(582)					(582)
Balance at Mar. 31, 2013	$ 1,128,077	$ 1,906	$ 954,801	$ 152,496	$ 5,352	$ 13,522
Balance (in shares) at Mar. 31, 2013	190,611,865	190,611,865