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Intangible Asset and Goodwill (Details 3) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Existing technology
Dec. 31, 2012
Existing technology
Sep. 30, 2013
Existing technology
Minimum
Dec. 31, 2012
Existing technology
Minimum
Sep. 30, 2013
Existing technology
Maximum
Dec. 31, 2012
Existing technology
Maximum
Sep. 30, 2013
Customer contracts and contractual relationships
Dec. 31, 2012
Customer contracts and contractual relationships
Sep. 30, 2013
Customer contracts and contractual relationships
Minimum
Dec. 31, 2012
Customer contracts and contractual relationships
Minimum
Sep. 30, 2013
Customer contracts and contractual relationships
Maximum
Dec. 31, 2012
Customer contracts and contractual relationships
Maximum
Sep. 30, 2013
Non-compete agreements
Dec. 31, 2012
Non-compete agreements
Sep. 30, 2013
Favorable contracts
Sep. 30, 2012
Favorable contracts
Sep. 30, 2013
Favorable contracts
Sep. 30, 2012
Favorable contracts
Dec. 31, 2012
Favorable contracts
Sep. 30, 2012
Various Acquisitions
Sep. 30, 2013
CTO Segment
Sep. 30, 2013
CTO Segment
Components of intangible assets                                                      
Intangible asset reclassified to assets held for use $ 2,000,000                                                    
Goodwill, Impairment Loss     8,070,000                                             8,070,000 8,070,000
Useful Life (in years)               3 years 3 years 10 years 10 years     1 year 1 year 10 years 10 years 3 years 3 years                
Gross Carrying Amount 228,295,000   228,295,000   224,765,000 195,345,000 191,815,000         32,650,000 32,650,000         300,000 300,000                
Accumulated Amortization (95,847,000)   (95,847,000)   (71,592,000) (77,105,000) (57,240,000)         (18,509,000) (14,194,000)         (233,000) (158,000)                
Net Carrying Amount 132,448,000   132,448,000   153,173,000 118,240,000 134,575,000         14,141,000 18,456,000         67,000 142,000                
Intangible asset purchased           2,500,000                                          
Proceeds from sale of intellectual property     2,250,000 0   2,250,000                                          
Business combinations and asset acquisitions, Purchase Price                                                 48,200,000    
Cash received related to favorable contracts                                       900,000 1,100,000 2,200,000 4,700,000        
Acquired intangible assets                                       2,600,000   2,600,000   4,800,000      
Amortization expense for intangible assets $ 7,400,000 $ 8,000,000 $ 21,420,000 $ 23,535,000