Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 197,708	$ 178,757
Short-term investments	669,353	490,177
Accounts receivable, net of allowance for doubtful accounts of $703 and $2,022 at December 31, 2014 and 2013, respectively	111,993	101,974
Revenue earned in excess of billings	27,493	22,275
Deferred income taxes and other current assets	56,930	49,929
Total current assets	1,063,477	843,112
Property and equipment	210,206	198,687
Less accumulated depreciation and amortization	101,155	89,082
Property and equipment, net	109,051	109,605
Goodwill	906	906
Non-current term deposits with banks	105	163
Deferred income taxes and other non-current assets	50,476	43,390
TOTAL ASSETS	1,224,015	997,176
Current liabilities:
Accounts payable	9,323	9,947
Accrued payroll and related costs	60,765	56,308
Income taxes payable	23,781	19,224
Accrued liabilities	24,250	26,714
Deferred revenue	3,266	4,729
Loans and borrowings	8,852	7,363
Total current liabilities	130,237	124,285
Other non-current liabilities	16,198	11,970
Non-current loans and borrowings	129,750	138,375
TOTAL LIABILITIES	276,185	274,630
Commitments and contingencies ( See Note 13 )
SHAREHOLDERS' EQUITY
Common Stock, no par value per share, 100,000,000 shares authorized; 83,741,918 and 83,514,036 shares issued and outstanding at December 31, 2014 and 2013, respectively	1	1
Restricted stock, 564,314 and 501,292 shares issued and outstanding at December 31, 2014 and 2013, respectively	30,935	23,450
Additional paid-in capital	67,422	67,422
Accumulated other comprehensive loss	(186,244)	(154,303)
Retained earnings	1,035,716	785,976
Total shareholders' equity	947,830	722,546
Total liabilities and shareholders' equity	$ 1,224,015	$ 997,176