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Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]      
Allowance for Doubtful Accounts, Balance at beginning of year $ 59,188 $ 64,129 $ 54,238
Allowance for doubtful accounts, Charged to Income (2,484) 656 9,201
Allowance for Doubtful Accounts, Other [1] 2,093 682 8,098
Allowance for Doubtful Accounts, Write-down 9,138 6,279 7,408
Allowance for Doubtful Accounts, Balance at end of year $ 49,659 $ 59,188 $ 64,129
[1] Represents the allowance for doubtful accounts of the businesses acquired by the company during 2015, 2014, and 2013.