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Subsequent events	3 Months Ended
Subsequent events	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent events	Subsequent Events On April 4, 2019, Centennial entered into a $150.0 million senior note purchase agreement with interest rates between 4.53 percent and 4.73 percent and maturities between April 4, 2029 and April 4, 2034. On April 12, 2019, Centennial entered into a $50.0 million term loan agreement with a variable interest rate, which matures on April 11, 2020.