Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, plant and equipment, net	$ 1,556,378	$ 1,559,335
Construction-in-process	$ 306,709	$ 248,835
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)	49,667,340	49,107,901
Common stock, shares outstanding (in shares)	49,667,340	49,107,901
Senior Secured Notes [Member]
Deferred financing costs	$ 9,177	$ 10,852
Other Loans, Limited and Non-recourse [Member]
Deferred financing costs	6,409	7,492
Senior Unsecured Bonds [Member]
Deferred financing costs	$ 755	$ 283
Senior unsecured bonds	7.00%	7.00%
Senior unsecured bonds unamortized premium	$ 0	$ 513
Other Loans, Full Recourse [Member]
Deferred financing costs	1,346	435
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, net	1,483,224	1,481,258
Construction-in-process	$ 120,853	$ 129,165