Consolidated Statements Of Equity (USD $) In Thousands	Total	Common stock	Additional paid-in capital	Retained earnings (deficit)	Accumulated other comprehensive income (loss)	Noncontrolling interest
Balance at Dec. 31, 2009	$ 349,657	$ 1,300	$ 751,360	$ (433,968)	$ 27,500	$ 3,465
Balance (in shares) at Dec. 31, 2009		130,043
Shares issued under stock plans (in shares)		2,858
Shares issued under stock plans	6,799	29	6,770
Share-based compensation expense	7,588		7,588
Tax benefit associated with stock plans	149		149
Pension liability adjustment	(837)				(837)
Foreign currency translation	15,535				15,372	163
Net income	85,122			84,356		766
Balance at Dec. 31, 2010	464,013	1,329	765,867	(349,612)	42,035	4,394
Balance (in shares) at Dec. 31, 2010		132,901
Shares issued under stock plans (in shares)		2,920
Shares issued under stock plans	11,690	29	11,661
Share-based compensation expense	7,519		7,519
Tax benefit associated with stock plans	657		657
Purchase of noncontrolling interest	(1,483)		2,969		562	(5,014)
Pension liability adjustment	2,386				2,386
Reclassification of cumulative translation adjustment associated with sale of equity method investee	(1,715)				(1,715)
Foreign currency translation	925				705	220
Net income	124,246			123,846		400
Balance at Dec. 31, 2011	608,238	1,358	788,673	(225,766)	43,973
Balance (in shares) at Dec. 31, 2011		135,821
Shares issued under stock plans (in shares)		2,694
Shares issued under stock plans	7,431	28	7,403
Share-based compensation expense	9,881		9,881
Repurchase and retirement of common stock (in shares)		(57)
Repurchase and retirement of common stock	(427)	(1)	(329)	(97)
Tax benefit associated with stock plans	3,886		3,886
Pension liability adjustment	(295)				(295)
Reclassification of foreign currency translation associated with acquisition of business	(216)				(216)
Foreign currency translation	(2,524)				(2,524)
Net income	68,825			68,825
Balance at Dec. 31, 2012	$ 694,799	$ 1,385	$ 809,514	$ (157,038)	$ 40,938
Balance (in shares) at Dec. 31, 2012		138,458