Commitments and Contingencies Commitments and Contingencies (Class Action Litigation) (Details) - lawsuit	1 Months Ended
	Jan. 27, 2016	Nov. 30, 2015
Lawsuits Filed in the United States District Court for the Southern District of Texas [Member]
Loss Contingencies [Line Items]
Number of lawsuits filed		4
Subsequent Event [Member] | Derivative Lawsuit Against Officers and Directors [Member]
Loss Contingencies [Line Items]
Number of lawsuits filed	3
Subsequent Event [Member] | Derivative Lawsuit Filed in District Court of Harris County, Texas [Member]
Loss Contingencies [Line Items]
Number of lawsuits filed	2
Subsequent Event [Member] | Derivative Lawsuit Filed in the United States District Court for Southern District of Texas [Member]
Loss Contingencies [Line Items]
Number of lawsuits filed	1