Advances for Rigs and Drillships under Construction (Tables)

6 Months Ended

Jun. 30, 2012

Advances For Rigs And Drillships Under Construction (Abstract)

Advances for Rigs and Drillships under Construction

Balance, December 31, 2011	$	754,925
Advances for drillships under construction and related costs		25,493
Balance, June 30, 2012	$	780,418