Contingent Liabilities (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended		3 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended	29 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 06, 2014 Butte Local Development v. Masters Group v. Comerica Bank [Member]	Nov. 16, 2011 Butte Local Development v. Masters Group v. Comerica Bank [Member]	Dec. 31, 2013 Butte Local Development v. Masters Group v. Comerica Bank [Member]	Dec. 31, 2008 Butte Local Development [Member] Butte Local Development v. Masters Group v. Comerica Bank [Member]	Jan. 17, 2014 Comerica Bank [Member] Masters Group [Member] Butte Local Development v. Masters Group v. Comerica Bank [Member]	Jul. 31, 2006 Comerica Bank [Member] Masters Group [Member] Butte Local Development v. Masters Group v. Comerica Bank [Member]	Dec. 30, 2008 Comerica Bank [Member] Masters Group [Member] Butte Local Development v. Masters Group v. Comerica Bank [Member]	Jan. 17, 2014 Comerica Bank [Member] Butte Local Development [Member] Butte Local Development v. Masters Group v. Comerica Bank [Member]	Dec. 31, 2013 Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Lawsuit Filing Date					November 16, 2011
Loss Contingency, Range of Possible Loss, Minimum												$ 0
Loss Contingency, Range of Possible Loss, Maximum												110,000,000
Loss Contingency, Trial Commencement Date				Jan. 06, 2014
Initial Line Of Credit Extended									9,000,000
Loan Amount After Subsequent Increase										10,500,000
Amount owed by Masters to Butte Local Development							200,000
Loss Contingency, Damages Awarded, Value								52,000,000			275,000
Litigation-related expense	52,000,000	23,000,000	10,000,000			52,000,000
Legal fees	$ 24,000,000	$ 31,000,000	$ 43,000,000