Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details)

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Intangible Assets (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Intangible Assets [Abstract]    
Gross carrying value of amortizable and non-amortizable intangible assets $ 9,400,000 $ 9,400,000
Accumulated amortization 8,300,000 8,100,000
Purchase of corporate headquarters   13,400,000
Leases-in-Place [Member]
   
Intangible Assets [Line Items]    
Intangible assets purchased $ 700,000 $ 700,000