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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Principle - Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 19,038 | $ 14,536 | $ 15,924 | $ 12,574 | $ 10,110 | $ 11,247 | $ 8,099 | $ 749 | $ 62,072 | $ 30,205 | $ (84)
Total adjustment in net income |  |  |  |  |  |  |  |  |  | (657,721) | (435,405)
Net cash used in operating activities |  |  |  |  |  |  |  |  | (45,243) | (627,516) | (435,489)
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (2,256,550) | (463,154) | (1,303,482)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 2,226,718 | 1,211,751 | 1,740,446
Net change in cash and cash equivalents |  |  |  |  |  |  |  |  | (75,075) | 121,081 | 1,475
Cash and cash equivalents at beginning of year |  |  |  | 231,199 |  |  |  | 110,118 | 231,199 | 110,118 | 108,643
Cash and cash equivalents at end of year | $ 156,124 |  |  |  | 231,199 |  |  |  | 156,124 | 231,199 | 110,118
As Previously Reported |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 30,318 | 79
Total adjustment in net income |  |  |  |  |  |  |  |  |  | (657,834) | (435,568)
Net cash used in operating activities |  |  |  |  |  |  |  |  |  | (627,516) | (435,489)
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (463,154) | (1,303,482)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  | 1,211,751 | 1,740,446
Net change in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 121,081 | 1,475
Cash and cash equivalents at beginning of year |  |  |  | 231,199 |  |  |  | 110,118 | 231,199 | 110,118 | 108,643
Cash and cash equivalents at end of year |  |  |  |  | 231,199 |  |  |  |  | 231,199 | 110,118
Effect of Change in Accounting Principle |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (113) | (163)
Total adjustment in net income |  |  |  |  |  |  |  |  |  | 113 | 163
Net cash used in operating activities |  |  |  |  |  |  |  |  |  | 0 | 0
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | 0 | 0
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  | 0 | 0
Net change in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 0 | 0
Cash and cash equivalents at beginning of year |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | 0 | 0
Cash and cash equivalents at end of year |  |  |  |  | $ 0 |  |  |  |  | $ 0 | $ 0

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