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Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2013
Acquisitions  
Summary of cumulative consideration paid for acquisitions and allocation of purchase price

 

 

 
   2011   2012   2013  

Cash Paid (gross of cash acquired)

   $ 80,439 (1) $ 131,972   $ 321,121 (1)

Contingent Consideration

     2,900     —     —  

Fair Value of Previously Held Equity Interest

     11,694     4,265     —  

Fair Value of Noncontrolling Interest

     —     1,000     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total Consideration

     95,033     137,237     321,121  

Fair Value of Identifiable Assets Acquired:

                    

Cash, Accounts Receivable, Prepaid Expenses, Deferred Income Taxes and Other

     7,918     18,998     28,532  

Property, Plant and Equipment(2)

     6,002     11,794     44,681  

Customer Relationship Assets(3)

     59,100     59,479     173,733  

Other Assets

     653     4,620     68  

Liabilities Assumed and Deferred Income Taxes(4)

     (15,245 )   (15,947 )   (67,645 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total Fair Value of Identifiable Net Assets Acquired

     58,428     78,944     179,369  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Goodwill Initially Recorded

   $ 36,605   $ 58,293   $ 141,752  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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(1)
Included in cash paid for acquisitions in the Consolidated Statements of Cash Flows for the years ended December 31, 2011 and 2013 are contingent and other payments of $132 and $76, respectively related to acquisitions made in the current and previous years.

(2)
Consists primarily of racking structures, leasehold improvements and computer hardware and software.

(3)
The weighted average lives of customer relationship assets associated with acquisitions in 2011, 2012 and 2013 was 20 years, 17 years and 22 years, respectively.

(4)
Consists primarily of accounts payable, accrued expenses, notes payable, deferred revenue and deferred income taxes.