Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued salaries and other compensation	$ 3,303	$ 2,710
Insurance	1,632	488
Deferred mobilization revenues	1,342	1,281
Property, sales and other taxes	2,104	1,710
Other	516	781
Accrued liabilities	$ 8,897	$ 6,970