June 30,

2013

December 31,

2012

(in thousands)

Performance bonds totaling $5.7 million for properties in Peru

$

3,460

$

3,338

Insurance bonds for import duties related to a construction vessel

-

825

Performance obligations and commitments for the gas-to power site

650

Secured letters of credit

250

259

$75.0 million secured debt facility

-

35,000

$40.0 million secured debt facility

4,759

32,727

Unsecured performance bond totaling $0.2 million for office lease agreement

-

Restricted cash

$

9,119

$

72,799

Current portion of restricted cash as of the end of the period

$

5,010

$

25,129

Long-term portion of restricted cash as of the end of the period

$

4,109

$

47,670