Commitments and Contingencies (Outstanding Performance Letters Of Credit) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 46,845
CNA [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	45,659
Other Letters of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 1,186