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Accrued Expenses Accrued Expenses Footnote (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Concentration Risk [Line Items] |  |
Accrued expenses |  | $ 112.1
Total Current Liabilities |  |
Concentration Risk [Line Items] |  |
Benchmark for individual components of accrued expenses, percentage | 5.00% |

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