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Debt and Credit Facility	3 Months Ended
Debt and Credit Facility	Mar. 31, 2017
Debt Disclosure [Abstract]
Debt and Credit Facility	Debt and Credit Facility Senior Notes 5.875% Senior Notes. In May 2016, we issued $375.0 million principal amount of 5.875% unsecured senior notes due May 15, 2024 ("5.875% Senior Notes") at 100% of the principal amount. The unamortized amount of debt issuance costs as of March 31, 2017 was $6.1 million. Interest expense, including amortization of debt issuance costs, relating to the 5.875% Senior Notes was $5.7 million for the quarter ended March 31, 2017. A portion of the interest relating to the 5.875% Senior Notes was capitalized as construction in progress. The effective interest rate of the 5.875% Senior Notes is approximately 6.1% per annum, taking into account the amortization of debt issuance costs. The fair value of the outstanding 5.875% Senior Notes, which are Level 1 liabilities, was calculated based on broker quotes and was approximately $390.0 million and $390.8 million at March 31, 2017 and December 31, 2016, respectively. 8.25% Senior Notes. In May 2012, we issued $225.0 million principal amount of 8.25% unsecured senior notes due June 1, 2020 ("8.25% Senior Notes"), of which $197.8 million principal amount remained outstanding at December 31, 2015. On June 1, 2016 we redeemed in full all remaining 8.25% Senior Notes at a redemption price of 104.125% of the principal amount. Interest expense, including amortization of debt issuance costs, relating to the 8.25% Senior Notes was $4.3 million for the quarter ended March 31, 2016. A portion of the interest relating to the 8.25% Senior Notes was capitalized as construction in progress. Revolving Credit Facility Our credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, and the other financial institutions party thereto ("Revolving Credit Facility") provides us with a $300.0 million funding commitment through December 2020. We had $293.9 million of borrowing availability under the Revolving Credit Facility at March 31, 2017, based on the borrowing base determination then in effect. At March 31, 2017, there were no borrowings under the Revolving Credit Facility and $7.7 million was being used to support outstanding letters of credit, leaving $286.2 million of net borrowing availability. The interest rate applicable to any overnight borrowings under the Revolving Credit Facility would have been 4.25% at March 31, 2017.