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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Principle - Consolidated Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income | $ 12,574 us-gaap_NetIncomeLoss | $ 749 us-gaap_NetIncomeLoss
Total adjustment in net income |  | (268,676)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash used in operating activities | (69,989)us-gaap_NetCashProvidedByUsedInOperatingActivities | (267,927)us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by investing activities | (6,798)us-gaap_NetCashProvidedByUsedInInvestingActivities | 88,474 us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash provided by financing activities | 110,990 us-gaap_NetCashProvidedByUsedInFinancingActivities | 402,974 us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents | 34,203 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 223,521 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 231,199 us-gaap_CashAndCashEquivalentsAtCarryingValue | 110,118 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 265,402 us-gaap_CashAndCashEquivalentsAtCarryingValue | 333,639 us-gaap_CashAndCashEquivalentsAtCarryingValue
As Previously Reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income |  | 757 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Total adjustment in net income |  | (268,684)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net cash used in operating activities |  | (267,927)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net cash provided by investing activities |  | 88,474 us-gaap_NetCashProvidedByUsedInInvestingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net cash provided by financing activities |  | 402,974 us-gaap_NetCashProvidedByUsedInFinancingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net change in cash and cash equivalents |  | 223,521 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Cash and cash equivalents at beginning of period |  | 110,118 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Cash and cash equivalents at end of period |  | 333,639 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Effect of Change in Accounting Principle |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net income |  | (8)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Total adjustment in net income |  | 8 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Net cash used in operating activities |  | 0 us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Net cash provided by investing activities |  | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Net cash provided by financing activities |  | 0 us-gaap_NetCashProvidedByUsedInFinancingActivities / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Net change in cash and cash equivalents |  | 0 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Cash and cash equivalents at end of period |  | $ 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember

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- Definition The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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