Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 64,317	$ 89,870
Depreciation and amortization	20,522	17,257
Unrealized loss on foreign exchange, net	1,392	4,892
Provision for doubtful accounts, net	1,340	1,563
Share based compensation	7,540	6,129
Other non-cash items	935	1,197
Accounts receivable	(75,124)	(50,762)
Inventories	(923)	(38,163)
Prepaid expenses and other assets	(13,460)	(16,115)
Accounts payable	12,385	(545)
Accrued expenses and other liabilities	12,551	17,552
Income taxes	6,266	16,847
Cash used in operating activities	37,741	49,722
Cash flows from investing activities:
Cash paid for purchases of property and equipment	(19,676)	(16,312)
Proceeds from disposal of property and equipment	545	319
Cash paid for intangible assets	(11,833)	(4,501)
Restricted cash	(1,295)	(654)
Cash used in investing activities	(32,259)	(21,148)
Cash flows from financing activities:
Proceeds from bank borrowings	14,572	89,505
Repayment of bank borrowings and capital lease obligations	(11,334)	(90,578)
Issuances of common stock	1,439	1,531
Purchase of treasury stock	(12,533)
Repurchase of common stock for tax withholding	(256)	(493)
Cash provided by (used in) financing activities	(8,112)	(35)
Effect of exchange rate changes on cash	(2,364)	(7,299)
Net decrease in cash and cash equivalents	(4,994)	21,240
Cash and cash equivalents - beginning of period	294,348	257,587
Cash and cash equivalents - end of period	289,354	278,827
Supplemental disclosure of cash flow information-cash paid during the period for:
Interest	525	273
Income taxes	10,658	10,551
Supplemental disclosure of non-cash, investing, and financing activities:
Assets acquired under capitalized leases	61
Accrued purchases of property and equipment	2,715	1,762
Accrued purchases of intangibles	$ 1,803	$ 397