Consolidated Statements Of Equity (USD $) In Thousands	Total	Common stock	Additional paid-in capital	Retained earnings (deficit)	Foreign currency translation adjustments	Defined benefit pension adjustments	Noncontrolling interest
Balance at Dec. 31, 2010	$ 464,013	$ 1,329	$ 765,867	$ (349,612)	$ 45,185	$ (3,150)	$ 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	0	0	0	0
Share-based compensation expense	7,519	0	7,519	0	0	0	0
Tax benefit associated with stock plans	657	0	657	0	0	0	0
Purchase of noncontrolling interest	(1,483)	0	2,969	0	562	0	(5,014)
Pension liability adjustment	2,386	0	0	0	0	2,386	0
Reclassification of cumulative translation adjustment associated with acquisition of business	0
Reclassification of cumulative translation adjustment associated with sale and liquidation	(1,715)	0	0	0	(1,715)	0	0
Foreign currency translation	925	0	0	0	705	0	220
Net income	124,246	0	0	123,846	0	0	400
Balance at Dec. 31, 2011	608,238	1,358	788,673	(225,766)	44,737	(764)	0
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	0	0	0	0
Share-based compensation expense	9,881	0	9,881	0	0	0	0
Repurchase and retirement of common stock (in shares)		(57)
Repurchase and retirement of common stock	(427)	(1)	(329)	(97)	0	0	0
Tax benefit associated with stock plans	3,886	0	3,886	0	0	0	0
Pension liability adjustment	(295)	0	0	0	0	(295)	0
Reclassification of cumulative translation adjustment associated with acquisition of business	(216)	0	0	0	(216)	0	0
Reclassification of cumulative translation adjustment associated with sale and liquidation	0
Foreign currency translation	(2,524)	0	0	0	(2,524)	0	0
Net income	68,825	0	0	68,825	0	0	0
Balance at Dec. 31, 2012	694,799	1,385	809,514	(157,038)	41,997	(1,059)	0
Balance (in shares) at Dec. 31, 2012		138,458
Shares issued under stock plans (in shares)		1,882
Shares issued under stock plans	7,685	18	7,667	0	0	0	0
Share-based compensation expense	7,928	0	7,928	0	0	0	0
Repurchase and retirement of common stock (in shares)		(1,606)
Repurchase and retirement of common stock	(15,494)	(16)	(9,391)	(6,087)	0	0	0
Tax benefit associated with stock plans	3,914	0	3,914	0	0	0	0
Pension liability adjustment	202	0	0	0	0	202	0
Reclassification of cumulative translation adjustment associated with acquisition of business	0
Reclassification of cumulative translation adjustment associated with sale and liquidation	787	0	0	0	787	0	0
Foreign currency translation	(17,504)	0	0	0	(17,504)	0	0
Net income	74,526	0	0	74,526	0	0	0
Balance at Dec. 31, 2013	$ 756,843	$ 1,387	$ 819,632	$ (88,599)	$ 25,280	$ (857)	$ 0
Balance (in shares) at Dec. 31, 2013		138,734