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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance For Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 11,729 $ 12,619 $ 9,248
“Additions” Charged to Costs and Expenses 8,550 8,769 11,480
“Other” Additions (Deductions) 0 0 0
“Less” Deductions 9,030 9,659 8,109
Balance at End of Year 11,249 11,729 12,619
Insurance Reserves [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 31,821 31,137 30,880
“Additions” Charged to Costs and Expenses 62,313 54,341 52,858
“Other” Additions (Deductions) 0 0 0
“Less” Deductions 59,494 53,657 52,601
Balance at End of Year $ 34,640 $ 31,821 $ 31,137