Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
U.S. federal statutory corporate pretax rate	35.00%
State NOL carryforwards, valuation allowance		$ 1.1
Ownership percentage change		5.00%
Change in beneficial ownership, percentage		50.00%
Annual limitation on net operating loss carryforwards		12.6
Pre-change in net operating loss		9.8
Stock-based compensation deductions not reflected in deferred tax assets		29.2
Recognized deferred tax assets associated with stock based compensation tax deductions		10.2
United States Of America [Member]
Income Taxes [Line Items]
Operating loss carry forwards subject to expiration	$ 174.4