Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Income Taxes [Line Items]
U.S. federal statutory corporate pretax rate	35.00%
Minimum [Member]
Income Taxes [Line Items]
Net operating loss carryforward expiration dates	2019
Maximum [Member]
Income Taxes [Line Items]
Net operating loss carryforward expiration dates	2032
United States Of America [Member]
Income Taxes [Line Items]
Operating loss carry forwards subject to expiration	190.2