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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:        
Net income $ 14,536 $ 11,247 $ 43,034 $ 20,095
Total adjustment in net income       (561,140)
Net cash provided by (used in) operating activities     40,396 (541,045)
Net cash used in investing activities     (1,147,121) (259,754)
Net cash provided by financing activities     1,254,489 875,666
Net change in cash and cash equivalents     147,764 74,867
Cash and cash equivalents at beginning of period     231,199 110,118
Cash and cash equivalents at end of period $ 378,963 184,985 378,963 184,985
As Previously Reported        
Cash flows from operating activities:        
Net income   11,226   20,104
Total adjustment in net income       (561,149)
Net cash provided by (used in) operating activities       (541,045)
Net cash used in investing activities       (259,754)
Net cash provided by financing activities       875,666
Net change in cash and cash equivalents       74,867
Cash and cash equivalents at beginning of period     231,199 110,118
Cash and cash equivalents at end of period   184,985   184,985
Effect of Change in Accounting Principle        
Cash flows from operating activities:        
Net income   21   (9)
Total adjustment in net income       9
Net cash provided by (used in) operating activities       0
Net cash used in investing activities       0
Net cash provided by financing activities       0
Net change in cash and cash equivalents       0
Cash and cash equivalents at beginning of period     $ 0  
Cash and cash equivalents at end of period   $ 0   $ 0