CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 170,893	$ 178,757
Short term investments	598,868	490,177
Accounts receivable, net of allowance for doubtful accounts of $ 2,040 and $ 2,022 at June 30, 2014 and December 31, 2013, respectively	106,870	101,974
Revenue earned in excess of billings	30,710	22,275
Deferred income taxes and other current assets	73,217	49,929
Total current assets	980,558	843,112
Property and equipment	211,396	198,687
Less accumulated depreciation and amortization	98,985	89,082
Property and equipment, net	112,411	109,605
Goodwill	906	906
Non current term deposits with banks	0	163
Deferred income taxes and other non current assets	44,852	43,390
TOTAL ASSETS	1,138,727	997,176
Current liabilities:
Accounts payable	11,466	9,947
Accrued payroll and related costs	50,341	56,308
Income taxes payable	26,884	19,224
Accrued liabilities	26,699	26,714
Deferred revenue	3,364	4,729
Loans and borrowings	8,116	7,363
Total current liabilities	126,870	124,285
Other non current liabilities	13,254	11,970
Non current loans and borrowings	134,250	138,375
TOTAL LIABILITIES	274,374	274,630
Commitments and contingencies ( See Note 15)
SHAREHOLDERS' EQUITY
Total shareholders' equity	864,353	722,546
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,138,727	$ 997,176