Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands |
12 Months Ended | ||||
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Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
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Movement in Valuation Allowances and Reserves [Roll Forward] | |||||
Allowance for Doubtful Accounts, Balance at beginning of year | $ 49,659 | $ 59,188 | $ 64,129 | ||
Allowance for doubtful accounts, Charged to Income | 8,336 | (8) | 3,789 | ||
Valuation Allowances and Reserves, Charged to Other Accounts | [1] | (392) | (383) | (2,451) | |
Allowance for Doubtful Accounts, Write-down | 5,347 | 9,138 | 6,279 | ||
Allowance for Doubtful Accounts, Balance at end of year | $ 52,256 | $ 49,659 | $ 59,188 | ||
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