Contingent Liabilities (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Pending Litigation	Dec. 31, 2013 Butte Local Development v. Masters Group v. Comerica Bank	Jun. 30, 2014 Butte Local Development v. Masters Group v. Comerica Bank	Jan. 17, 2014 Butte Local Development v. Masters Group v. Comerica Bank Comerica Bank
Loss Contingencies [Line Items]
Amount of damages awarded by the jury								$ 52,000,000
Increase in reserve for litigation-related expense	3,000,000	1,000,000	6,000,000	4,000,000		52,000,000
Litigation-related reserve related to the case							54,000,000
Minimum amount of reasonably possible losses					0
Estimated maximum amount of reasonably possible losses					43,000,000
Legal Fees	$ 5,000,000	$ 7,000,000	$ 10,000,000	$ 14,000,000