Transactions With Related Parties Transactions With Related Parties (Schedule of Amount Received in Public and Private Partnerships) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Contract drilling	$ 0	$ 4	$ 16
Well supervision and other fees	423	435	470
General and administrative expense reimbursement	$ 18	$ 39	$ 36