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Column '1/1/2014 - 3/31/2014' is shorter (89 days) and has only 3 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 57 values. Shorter duration columns must have at least one fourth (14) as many values. Column '4/1/2014 - 6/30/2014' is shorter (90 days) and has only 2 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 57 values. Shorter duration columns must have at least one fourth (14) as many values. Column '7/1/2014 - 9/30/2014' is shorter (91 days) and has only 2 values, so it is being removed. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 365 days and at least 57 values. Shorter duration columns must have at least one fourth (14) as many values. Column '10/1/2014 - 12/31/2014' is shorter (91 days) and has only 4 values, so it is being removed. 'Monetary' elements on report '2410402 - Disclosure - Property, Plant, Equipment and Mine Development (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2413403 - Disclosure - Debt Credit Agreement (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2413406 - Disclosure - Debt Convertible Debentures (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '2417409 - Disclosure - Pension and Savings Plans (Details Textuals)' had a mix of different decimal attribute values. 'Shares' elements on report '2419407 - Disclosure - Share-Based Compensation (Details Textuals)' had a mix of different decimal attribute values. 'Monetary' elements on report '2419407 - Disclosure - Share-Based Compensation (Details Textuals)' had a mix of different decimal attribute values. 'Monetary' elements on report '2425401 - Disclosure - Commitments and Contingencies (Details 1)' had a mix of different decimal attribute values. 'Monetary' elements on report '2429404 - Disclosure - Supplemental Guarantor/Non-Guarantor Financial Information (Details 2)' had a mix of different decimal attribute values. Process Flow-Through: 1001000 - Statement - Consolidated Statements of Operations Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2014' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2014' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2014' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2014' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2013' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2013' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2013' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2013' Process Flow-Through: 1002000 - Statement - Consolidated Statements of Comprehensive Income Process Flow-Through: 1005000 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: 1006000 - Statement - Consolidated Statements of Cash Flows Process Flow-Through: 1007500 - Statement - Comprehensive Income Parenthetical (Parentheticals) Process Flow-Through: 1008500 - Statement - Balance Sheet Parenthetical (Parentheticals) Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: 1009500 - Statement - Stockholders' Equity Parenthetical (Parentheticals) btu-20141231.xml btu-20141231.xsd btu-20141231_cal.xml btu-20141231_def.xml btu-20141231_lab.xml btu-20141231_pre.xml true true