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Significant Accounting Policies - Schedule of Balances of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Accounts, receivables deemed uncollectible, period | 2 years |
Allowance for Doubtful Accounts |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at beginning of period | $ 204,252 | $ 196,270
Additions: charges to bad debt expense | 58,282 | 51,439
Additions: charges to other accounts | 1,124 | 190
Deductions | (65,635) | (45,490)
Balance at end of period | $ 198,023 | $ 202,409

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