Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 103,832	$ 83,540
Short-term investments	1,000	0
Accounts receivable	8,621	24,523
Income taxes receivable	1,842
Value-added tax receivable	14,817	20,569
Inventory	20,069	19,851
Restricted cash	5,010	25,129
Prepaid and other current assets	11,516	5,734
Total current assets	166,707	179,346
Property, equipment and construction in progress, net	228,239	238,557
Restricted cash	4,109	47,670
Other non-current assets	5,201	5,983
Investment in Ecuador property, net	551	632
Deferred tax asset	57,476	55,242
Total assets	462,283	527,430
Current liabilities:
Accounts payable	40,675	21,978
Accrued liabilities	19,154	34,013
Other liabilities	21,556	21,792
Current income taxes payable		10,460
Accrued interest payable	4,326	5,234
Derivative financial instruments	358	2,984
Current maturity of long-term debt	17,000	24,046
Total current liabilities	103,069	120,507
Asset retirement obligation	2,822	2,708
Other non-current liabilities	20,755	20,755
Long-term debt, net	180,132	197,160
Total long-term liabilities	203,709	220,623
Commitments and contingencies (Note 19 and 20)
Stockholders’ equity:
Preferred stock, no par value, 25,000 authorized; none issued and outstanding	0	0
Common stock, no par value, 250,000 authorized; 117,813 and 116,932 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	561,804	560,175
Accumulated deficit	(406,299)	(373,875)
Total stockholders’ equity	155,505	186,300
Total liabilities and stockholders’ equity	$ 462,283	$ 527,430