Revision of Previously Reported Financial Information Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 5,366	$ 7,950	$ 4,961	$ 35,464
Other operating activities and non-cash items			$ (6,177)	(9,745)
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income		10,201		39,898
Other operating activities and non-cash items				(14,179)
Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income		$ (2,251)		(4,434)
Other operating activities and non-cash items				$ 4,434