Consolidated Statements Of Equity (USD $) In Thousands	Total	Common stock	Additional paid-in capital	Retained deficit	Foreign currency translation adjustments	Defined benefit pension adjustments
Balance at Dec. 31, 2011	$ 608,238	$ 1,358	$ 788,673	$ (225,766)	$ 44,737	$ (764)
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
Share-based compensation expense	9,881	0	9,881	0	0	0
Repurchase and retirement of common stock (in shares)		(57)
Repurchase and retirement of common stock	(427)	(1)	(329)	(97)	0	0
Tax benefit associated with stock plans	3,886	0	3,886	0	0	0
Pension liability adjustment	(295)	0	0	0	0	(295)
Reclassification of cumulative translation adjustment associated with acquisition of business	(216)	0	0	0	(216)	0
Foreign currency translation	(2,524)	0	0	0	(2,524)	0
Net income	68,825	0	0	68,825	0	0
Balance at Dec. 31, 2012	694,799	1,385	809,514	(157,038)	41,997	(1,059)
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
Share-based compensation expense	7,928	0	7,928	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
Tax benefit associated with stock plans	3,914	0	3,914	0	0	0
Pension liability adjustment	202	0	0	0	0	202
Reclassification of cumulative translation adjustment associated with liquidated subsidiaries	787	0	0	0	787	0
Reclassification of cumulative translation adjustment associated with acquisition of business	0
Foreign currency translation	(17,504)	0	0	0	(17,504)	0
Net income	74,526	0	0	74,526	0	0
Balance at Dec. 31, 2013	756,843	1,387	819,632	(88,599)	25,280	(857)
Balance (in shares) at Dec. 31, 2013		138,734
Shares issued under stock plans (in shares)		1,059
Shares issued under stock plans	1,080	11	1,069	0	0	0
Share-based compensation expense	8,887	0	8,887	0	0	0
Tax benefit associated with stock plans	842	0	842	0	0	0
Pension liability adjustment	(150)	0	0	0	0	(150)
Reclassification of cumulative translation adjustment associated with acquisition of business	0
Foreign currency translation	(26,948)	0	0	0	(26,948)	0
Net income	7,887	0	0	7,887	0	0
Balance at Dec. 31, 2014	$ 748,441	$ 1,398	$ 830,430	$ (80,712)	$ (1,668)	$ (1,007)
Balance (in shares) at Dec. 31, 2014		139,793