Accrued Expense (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Insurance	$ 7,736	$ 8,285
Interest	7,717	7,759
Payroll and employee benefits	6,608	10,763
Income and other taxes	1,868	1,261
Fuel hedge liability	1,695
Percentage of completion adjustment	525	1,855
Other	1,328	1,198
Total accrued expenses	27,477	31,121
GLDD Corporation [Member]
Total accrued expenses	$ 8,469	$ 8,047