Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands		Mar. 31, 2021		Dec. 31, 2020
Current assets:
Cash and cash equivalents		$ 376,630		$ 448,252
Marketable securities at fair value		27,735		0
Restricted cash and cash equivalents (primarily related to VIEs)		88,449		88,526
Receivables:
Trade less allowance for credit losses of $597 and $597, respectively (primarily related to VIEs)		139,711		149,170
Other		10,513		17,987
Inventories		38,408		35,321
Costs and estimated earnings in excess of billings on uncompleted contracts	[1]	20,876		24,544
Prepaid expenses and other		22,613		15,354
Total current assets		724,935		779,154
Investment in unconsolidated companies		104,519		98,217
Deposits and other		52,956		66,989
Deferred income taxes		119,217		119,299
Property, plant and equipment, net		2,148,589		2,099,046
Construction-in-process		471,548		479,315
Operating leases right of use		15,627		16,347
Finance leases right of use		8,336		11,633
Intangible assets, net		189,249		194,421
Goodwill		24,237		24,566
Total assets		3,859,213	[2],[3]	3,888,987
Current liabilities:
Accounts payable and accrued expenses		148,071		152,763
Billings in excess of costs and estimated earnings on uncompleted contracts		12,686		11,179
Current portion of long-term debt:
Senior secured notes		24,963		24,949
Other loans		36,240		35,897
Full recourse		26,168		17,768
Operating lease liabilities		2,935		2,922
Finance lease liabilities		3,171		3,169
Total current liabilities		254,234		248,647
Long-term debt, net of current portion:
Senior secured notes (less deferred financing costs of $5,082 and $5,318, respectively)		306,891		315,195
Senior unsecured bonds (less deferred financing costs of $1,996 and $2,086, respectively)		698,271		717,534
Operating lease liabilities		12,332		12,897
Finance lease liabilities		5,851		9,104
Liability associated with sale of tax benefits		107,105		111,476
Deferred income taxes		87,421		87,972
Liability for unrecognized tax benefits		3,094		1,970
Liabilities for severance pay		18,202		18,749
Asset retirement obligation		64,354		63,457
Other long-term liabilities		6,086		6,235
Total liabilities		1,899,628		1,937,720
Commitments and contingencies (Note 10)
Redeemable noncontrolling interest		9,706		9,830
Equity:
Common stock, par value $0.001 per share; 200,000,000 shares authorized; 55,984,392 and 55,983,259 issued and outstanding as of March 31, 2021 and December 31, 2020, respectively		56		56
Additional paid-in capital		1,264,828		1,262,446
Retained earnings		558,644		550,103
Accumulated other comprehensive income (loss)		(6,920)		(6,620)
Total stockholders' equity attributable to Company's stockholders		1,816,608		1,805,985
Noncontrolling interest		133,271		135,452
Total equity		1,949,879		1,941,437
Total liabilities, redeemable noncontrolling interest and equity		3,859,213		3,888,987
Other Loans, Limited and Non-recourse [Member]
Long-term debt, net of current portion:
Other loans (less deferred financing costs)		276,186		284,928
Other Loans, Full Recourse [Member]
Long-term debt, net of current portion:
Other loans (less deferred financing costs)		$ 59,601		$ 59,556

[1] Contract assets and contract liabilities are presented as "Costs and estimated earnings in excess of billings on uncompleted contracts" and "Billings in excess of costs and estimated earnings on uncompleted contracts", respectively, on the consolidated balance sheets. The contract liabilities balance at the beginning of the year was not yet recognized as product revenues during the three months ended March 31, 2021 as a result of performance obligations having been satisfied.

[2] Electricity segment assets include goodwill in the amount of $20.1 million and $20.0 million as of March 31, 2021 and 2020, respectively. Energy Storage segment assets include goodwill in the amount of $4.1 million and none as of March 31, 2021 and 2020, respectively. No goodwill is included in the Product segment assets as of March 31, 2021 and 2020.

[3] Including unconsolidated investments