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Long-term debt	3 Months Ended
Long-term debt	Mar. 31, 2014
Debt Disclosure [Abstract]
Long-term debt	Long-term debt Centennial entered into a two year $125.0 million term loan agreement with a variable interest rate on March 31, 2014. In addition, borrowings outstanding that were classified as long-term debt under the Company’s and Centennial’s commercial paper programs totaled $283.5 million at March 31, 2014, compared to $153.9 million at December 31, 2013, respectively.