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Schedule II
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
   

Beginning

Balance

    

Charged to

Costs and

Expenses

    

Deductions

    

Acquisitions

    

Ending

Balance

  

Year ended December 31, 2013 Allowance for doubtful accounts

   $ 4,359       4,751       (1,656

)

     (246

)

     7,208  
                                         

Year ended December 31, 2014 Allowance for doubtful accounts

     7,208     $ 5,727     $ (3,004

)

   $ —     $ 9,931  
                                         

Year ended December 31, 2015 Allowance for doubtful accounts

   $ 9,931     $ 7,059     $ (4,803 )   $ —     $ 12,187  

All financial statement schedules not listed are omitted because they are inapplicable or the requested information is shown in the financial statements of the Registrant or in the related notes to the consolidated financial statements.