XML 20 R79.htm IDEA: XBRL DOCUMENT v2.4.0.8
Income Taxes - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2010
Mar. 31, 2014
Beginning tax year
Mar. 31, 2014
Beginning tax year as result of federal NOL carryforwards
Mar. 31, 2014
Minimum
Mar. 31, 2014
Maximum
Income Taxes              
Federal net operating loss carryforwards subject to the IRC Section 382 limitation     $ 923.0        
Unrecognized tax benefits 1.4 1.4          
Unrecognized tax benefits that would affect the effective tax rate if recognized 0.9            
Unrecognized tax benefits, accrued liability 0.1 0.1          
Beginning tax year, years open for federal examination       2010 2005    
Number of tax years open for state tax audit (in years)           3 years 5 years
Decrease in gross unrecognized tax benefits balance within next twelve months $ 0.8