Prepaid Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Prepaid Expenses [Abstract]
Prepaid drilling costs	$ 9,560	$ 30,101
Prepaid insurance	7,619	9,507
Prepaid taxes	13,624	572
Total	$ 30,803	$ 40,180