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'Monetary' elements on report '24021 - Disclosure - Basis of presentation and significant accounting policies (Details 2)' had a mix of different decimal attribute values. 'Monetary' elements on report '24022 - Disclosure - Basis of presentation and significant accounting policies (Details 3)' had a mix of different decimal attribute values. 'Monetary' elements on report '24030 - Disclosure - Debt (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '24031 - Disclosure - Debt (Details 2)' had a mix of different decimal attribute values. 'Shares' elements on report '24053 - Disclosure - Equity and stock-based compensation (Details 4)' had a mix of different decimal attribute values. 'Monetary' elements on report '24053 - Disclosure - Equity and stock-based compensation (Details 4)' had a mix of different decimal attribute values. 'Monetary' elements on report '24071 - Disclosure - Derivative financial instruments (Details 2)' had a mix of different decimal attribute values. 'Monetary' elements on report '24090 - Disclosure - Credit risk (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '24100 - Disclosure - Commitments and contingencies (Details)' had a mix of different decimal attribute values. Process Flow-Through: 10010 - Statement - Consolidated balance sheets Process Flow-Through: 10015 - Statement - Consolidated balance sheets (Parenthetical) Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: 10020 - Statement - Consolidated statements of operations Process Flow-Through: 10025 - Statement - Consolidated statements of operations (Parenthetical) Process Flow-Through: 10040 - Statement - Consolidated statements of cash flows Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2009' Process Flow-Through: 10045 - Statement - Consolidated statements of cash flows (Parenthetical) Process Flow-Through: 20010 - Statement - Consolidated balance sheets Process Flow-Through: Removing column 'Jun. 30, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: Removing column 'Jun. 30, 2011' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: Removing column 'Dec. 31, 2008' Process Flow-Through: 20015 - Statement - Consolidated balance sheets (Parenthetical) Process Flow-Through: Removing column 'Jun. 30, 2012' Process Flow-Through: 20020 - Statement - Consolidated statements of operations Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2011' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2010' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2010' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2010' Process Flow-Through: Removing column '6 Months Ended Jun. 30, 2012' Process Flow-Through: Removing column '6 Months Ended Jun. 30, 2011' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2010' Process Flow-Through: 20040 - Statement - Consolidated statements of cash flows Process Flow-Through: Removing column '6 Months Ended Jun. 30, 2012' Process Flow-Through: Removing column '6 Months Ended Jun. 30, 2011' lpi-20121001.xml lpi-20121001.xsd lpi-20121001_cal.xml lpi-20121001_def.xml lpi-20121001_lab.xml lpi-20121001_pre.xml true true