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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Event	18.Subsequent Event In December of 2017, the Company entered an accelerated share repurchase (“ASR”) contract with a commercial bank to purchase $200 million of the Common Stock. On January 4, 2018, the Company paid $200 million to the bank and received a total of 4.1 million shares during the first quarter of 2018. The Company used cash on hand plus borrowing to fund the initial purchase price.