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Subsequent event	3 Months Ended
Subsequent event	Mar. 31, 2014
Subsequent Events [Abstract]
Subsequent events [Text Block]	Subsequent Events Centennial entered into a two year $125.0 million term loan agreement with a variable interest rate on April 2, 2014. The Company entered into a $150.0 million note purchase agreement on January 28, 2014. On April 15, 2014, the Company issued $50.0 million of Senior Notes with a due date of April 15, 2044, at an interest rate of 5.2 percent. The remaining $100.0 million of Senior Notes under the agreement will be issued on July 15, 2014, with due dates ranging from July 2024 to July 2026 at a weighted average interest rate of 4.3 percent.