CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Ordinary Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance at Dec. 31, 2010	$ 282,074	$ 141	$ 265,481	$ 954	$ 15,498
Balance (in shares) at Dec. 31, 2010		34,231,204
Increase (Decrease) in Stockholders' Equity
Net income (loss)	10,334				10,334
Unrealized gains (losses) on available-for-sale securities, net of taxes	(109)			(109)
Unrealized gains (losses) on derivative contracts, net of taxes	(2,009)			(2,009)
Total comprehensive income (loss), net of tax	8,216
Share-based compensation	21,412		21,412
Exercise of share awards	14,000	7	13,993
Exercise of share awards (in shares)		1,810,582
Issuance of shares pursuant to employee share purchase plan	4,455	1	4,454
Issuance of shares pursuant to employee share purchase plan (in shares)		243,256
Issuance of shares in connection with public offering	104,217	16	104,201
Issuance of shares in connection with public offering (in shares)		3,450,000
Share-based compensation related to acquisitions	6,303		6,303
Income tax benefit from share options exercised	2,411		2,411
Balance at Dec. 31, 2011	443,088	165	418,255	(1,164)	25,832
Balance (in shares) at Dec. 31, 2011		39,735,042
Increase (Decrease) in Stockholders' Equity
Net income (loss)	111,951				111,951
Unrealized gains (losses) on available-for-sale securities, net of taxes	(133)			(133)
Unrealized gains (losses) on derivative contracts, net of taxes	4,091			4,091
Total comprehensive income (loss), net of tax	115,909
Share-based compensation	35,019		35,019
Exercise of share awards	23,688	12	23,676
Exercise of share awards (in shares)		2,641,607
Issuance of shares pursuant to employee share purchase plan	6,275	1	6,274
Issuance of shares pursuant to employee share purchase plan (in shares)		219,613
Income tax benefit from share options exercised	5,141		5,141
Balance at Dec. 31, 2012	629,120	178	488,365	2,794	137,783
Balance (in shares) at Dec. 31, 2012		42,596,262
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(23,342)				(23,342)
Unrealized gains (losses) on available-for-sale securities, net of taxes	142			142
Unrealized gains (losses) on derivative contracts, net of taxes	(1,546)			(1,546)
Total comprehensive income (loss), net of tax	(24,746)
Share-based compensation	45,138		45,138
Exercise of share awards	5,304	5	5,299
Exercise of share awards (in shares)		1,154,672
Issuance of shares pursuant to employee share purchase plan	9,333	2	9,331
Issuance of shares pursuant to employee share purchase plan (in shares)		248,486
Income tax benefit from share options exercised	2,662		2,662
Balance at Dec. 31, 2013	$ 666,811	$ 185	$ 550,795	$ 1,390	$ 114,442
Balance (in shares) at Dec. 31, 2013		43,999,420