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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In January 2018, we called for redemption of the remaining $145.2 million of the original $350 million aggregate principal amount of our outstanding 5.750% senior notes due 2021. The redemption was completed on February 15, 2018 and holders received a redemption price of 101.438% of the principal amount, plus accrued and unpaid interest.