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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