Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 67,201	$ 57,395
Accounts receivable	20,743	21,630
Income taxes receivable	1,973	2,134
Value-added tax receivable	1,494	10,490
Inventory	13,908	17,368
Restricted cash	1,000	1,250
Prepaid and other current assets	6,365	5,419
Total current assets	112,684	115,686
Property, equipment and construction in progress, net	224,806	217,753
Restricted cash	4,109	4,109
Other non-current assets	4,634	5,065
Investment in Ecuador property, net	517	534
Deferred tax asset	60,593	63,602
Total assets	407,343	406,749
Current liabilities:
Accounts payable	2,643	3,127
Accrued liabilities	12,454	11,246
Other liabilities	40,955	24,494
Accrued interest payable	4,883	5,119
Derivative financial instruments	269	30
Current maturity of long-term debt	58,169
Total current liabilities	119,373	44,016
Asset retirement obligation	1,730	1,564
Other non-current liabilities		16,755
Long-term debt, net	152,787	206,939
Total long-term liabilities	154,517	225,258
Commitments and contingencies (Note 18 and 19)
Stockholders’ equity:
Preferred stock, no par value, 25,000 authorized; none issued and outstanding	0	0
Common stock, no par value, 250,000 authorized; 118,553 and 117,526 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	571,158	569,061
Accumulated deficit	(437,705)	(431,586)
Total stockholders’ equity	133,453	137,475
Total liabilities and stockholders’ equity	$ 407,343	$ 406,749