Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Consolidated Statements Of Operations [Abstract]
Revenues	$ 274,088	$ 302,401	$ 881,952	$ 991,750
Cost of sales	153,267	146,801	443,891	475,323
Restructuring charges (Note 6)		583		2,612
Gross profit	120,821	155,017	438,061	513,815
Selling, general and administrative expenses	135,110	143,719	429,815	434,244
Restructuring charges (Note 6)	981	7,585	7,454	13,895
Asset impairment charges (Note 2)	5,460	2,600	7,535	5,830
Income (loss) from operations	(20,730)	1,113	(6,743)	59,846
Foreign currency transaction loss, net	(2,908)	(1,290)	(2,631)	(4,278)
Interest income	268	424	752	1,304
Interest expense	(171)	(366)	(650)	(685)
Other income (loss), net	405	217	(6)	388
Income (loss) before income taxes	(23,136)	98	(9,278)	56,575
Income tax benefit (expense)	(888)	15,669	(3,745)	(8,407)
Net income (loss)	(24,024)	15,767	(13,023)	48,168
Dividends on Series A convertibles preferred shares (Note 13)	(3,000)	(3,067)	(8,833)	(8,233)
Dividend equivalents on Series A convertible preferred shares related to redemption value accretion and beneficial conversion feature (Note 13)	(752)	(691)	(2,209)	(2,030)
Net income (loss) attributable to common stockholders	$ (27,776)	$ 12,009	$ (24,065)	$ 37,905
Net income (loss) per common share (Note 12):
Basic	$ (0.37)	$ 0.12	$ (0.32)	$ 0.38
Diluted	$ (0.37)	$ 0.12	$ (0.32)	$ 0.37