CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 500,499	$ 197,708
Short-term investments	540,045	669,353
Accounts receivable, net of allowance for doubtful accounts of $622 and $703 at December 31, 2015 and 2014, respectively	136,926	111,993
Revenue earned in excess of billings	30,448	27,493
Deferred income taxes and other current assets	44,575	56,930
Total current assets	1,252,493	1,063,477
Property and equipment	217,922	210,206
Less accumulated depreciation and amortization	112,146	101,155
Property and equipment, net	105,776	109,051
Goodwill	906	906
Non-current term deposits with banks	77	105
Deferred income taxes and other non-current assets	64,018	50,476
TOTAL ASSETS	1,423,270	1,224,015
Current liabilities:
Accounts payable	14,678	9,323
Accrued payroll and related costs	60,339	60,765
Income taxes payable	11,305	23,781
Accrued liabilities	23,214	24,250
Deferred revenue	7,716	3,266
Loans and borrowings	129,981	8,852
Total current liabilities	247,233	130,237
Other non-current liabilities	17,592	16,198
Non-current loans and borrowings		129,750
TOTAL LIABILITIES	$ 264,825	$ 276,185
Commitments and contingencies ( See Note 13 )
SHAREHOLDERS' EQUITY
Common Stock, no par value per share, 200,000,000 shares authorized; 83,947,151 and 83,741,918 shares issued and outstanding at December 31, 2015 and 2014, respectively	$ 1	$ 1
Restricted stock,465,290 and 564,314 shares issued and outstanding at December 31, 2015 and 2014, respectively	38,389	30,935
Additional paid-in capital	67,422	67,422
Accumulated other comprehensive loss	(235,609)	(186,244)
Retained earnings	1,288,242	1,035,716
Total shareholders' equity	1,158,445	947,830
Total liabilities and shareholders' equity	$ 1,423,270	$ 1,224,015