Other non-current assets (Tables)

6 Months Ended

Jun. 30, 2012

Other non-current assets (Abstract)

Other non-current assets

		December 31, 2011		June 30, 2012
Security deposits for derivatives	$	33,100	$	-
Option for construction of drillships		24,756		24,756
Deferred mobilization expenses		24,176		59,496
Other		9,049		17,734
Balance at end of year/period	$	91,081	$	101,986