Consolidated Statements of Cash Flow (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 18,910	$ 18,998
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,035	12,874
Stock-based compensation expense	6,142	6,505
Amortization of deferred financing costs	53	76
Unrealized foreign exchange gain/(loss)	2,206	(4,788)
Deferred income taxes	2,709	2,373
Gain on sale of fixed assets	(61)
Non-controlling interest		2
Change in operating assets and liabilities:
Restricted cash	(291)	44
Accounts receivable	2,472	(3,896)
Prepaid expenses and other current assets	(2,008)	(2,389)
Accounts payable	419	(1,283)
Deferred revenue	1,035	46
Accrued employee cost	(4,940)	(6,599)
Accrued expenses and other liabilities	(3,959)	2,882
Advance income tax, net	(6,263)	489
Other assets	(1,706)	67
Net cash provided by operating activities	27,753	25,401
Cash flows from investing activities:
Purchase of fixed assets	(16,637)	(10,281)
Business acquisition (net of cash acquired)		(1,183)
Purchase of short-term investments	(1,408)	(166)
Proceeds from redemption of short-term investments		281
Net cash used for investing activities	(18,045)	(11,349)
Cash flows from financing activities:
Principal payments on capital lease obligations	(564)	(787)
Acquisition of treasury stock	(459)	(389)
Proceeds from exercise of stock options	2,813	2,456
Net cash provided by financing activities	1,790	1,280
Effect of exchange rate changes on cash and cash equivalents	1,374	(3,800)
Net increase in cash and cash equivalents	12,872	11,532
Cash and cash equivalents, beginning of period	148,065	103,037
Cash and cash equivalents, end of period	$ 160,937	$ 114,569