Employee Benefits Salary Continuation Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
San Francisco Salary Continuation Plan [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Postemployment Benefits, Period Expense	$ 0.1	$ 0.2	$ 0.1
Postemployment Benefits Liability	1.7	1.6
Cash Surrender Value of Life Insurance	5.8	6.2
Southern California Salary Continuation Plan [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Postemployment Benefits, Period Expense	0.2	0.2	0.2
Postemployment Benefits Liability	2.1	1.9
Cash Surrender Value of Life Insurance	$ 4.5	$ 4.3