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Goodwill Schedule of Reporting Units Goodwill Balances (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Percentage Change In Discount Rate Used To Evaluate Fair Value Of Reporting Unit For Goodwill Assessment | 1.00% |  |
Percentage Change In Operating Income Used To Evaluate Fair Value Of Reporting Unit For Goodwill Assessment | 3.00% |  |
Goodwill | $ 9,889,791 | $ 9,407,317 | $ 9,294,479
DMG |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 3,373,090 | $ 3,391,942 | $ 3,398,264
DMG | NEVADA |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 275,914 |  |
Carrying amount coverage | 17.00% |  |
Sensitivities, operating income | (2.40%) |  |
Sensitivities, discount rate | (3.80%) |  |
DMG | FLORIDA |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 397,127 |  |
Carrying amount coverage | 0.00% |  |
Sensitivities, operating income | (1.60%) |  |
Sensitivities, discount rate | (2.80%) |  |
DMG | NEW MEXICO |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 70,253 |  |
Carrying amount coverage | 0.00% |  |
Sensitivities, operating income | (1.60%) |  |
Sensitivities, discount rate | (2.40%) |  |
DMG | WASHINGTON |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 247,552 |  |
Carrying amount coverage | 9.30% |  |
Sensitivities, operating income | (1.70%) |  |
Sensitivities, discount rate | (3.60%) |  |

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