Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, net	$ 1,514,726	$ 1,481,258
Construction-in-process	64,668	129,165
Senior Secured Notes [Member]
Deferred financing costs	10,549	10,852
Other Loans, Limited and Non-recourse [Member]
Deferred financing costs	7,137	7,492
Senior Unsecured Bonds [Member]
Deferred financing costs	239	283
Other Loans, Full Recourse [Member]
Deferred financing costs	420	435
Property, plant and equipment, net	1,570,074	1,559,335
Construction-in-process	$ 220,981	$ 248,835
Senior unsecured bonds %	7.00%	7.00%
Senior unsecured bonds unamortized premium	$ 436	$ 513
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	49,320,335	49,107,901
Common stock, shares outstanding (in shares)	49,320,335	49,107,901