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SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS - Transactions in the Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance, beginning of year $ 43,455 $ 41,051 $ 39,292
Provision 5,136 11,538 15,092
Write-offs (9,048) (9,134) (13,333)
Balance, end of year $ 39,543 $ 43,455 $ 41,051