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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 31, 2018, the Company entered into a new $1.8 billion term loan agreement to fund the LaSalle merger in addition to providing increased liquidity and debt capacity. This new term loan will mature in five tranches, from 2020 to 2024. This loan has not yet been funded, so fees and interest expense have not been incurred, and will not be incurred until the closing of the merger.