Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Deferred tax assets	$ 105,978	$ 124,268
State tax credits benefit period	5 years
State tax credits, carry forward period	8 years
Unrecognized tax benefits	598	550	589
Unrecognized tax benefits, decreases resulting from settlements with taxing authorities	39
Unrecognized tax benefits, Interest on income taxes expense	6
Effective income tax rate on unrecognized tax benefits that would impact effective tax rate	0.30%
Accrued interest related to unrecognized tax benefits	168	167
Net operating loss carryforwards		1,291
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits, decreases resulting from settlements with taxing authorities	$ 47