Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Deferred Charges (Details)

v2.4.0.6
Summary of Significant Accounting Policies - Deferred Charges (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Abstract]      
Deferred Lease Costs Capitalized $ 5.1 $ 10.7 $ 6.1