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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:        
Net income $ 15,924 $ 8,099 $ 28,498 $ 8,848
Total adjustment in net income       (469,231)
Net cash used in operating activities     (65,178) (460,383)
Net cash used in investing activities     (126,571) (134,866)
Net cash provided by financing activities     419,540 743,182
Net change in cash and cash equivalents     227,791 147,933
Cash and cash equivalents at beginning of period     231,199 110,118
Cash and cash equivalents at end of period $ 458,990 258,051 458,990 258,051
As Previously Reported        
Cash flows from operating activities:        
Net income   8,121   8,878
Total adjustment in net income       (469,261)
Net cash used in operating activities       (460,383)
Net cash used in investing activities       (134,866)
Net cash provided by financing activities       743,182
Net change in cash and cash equivalents       147,933
Cash and cash equivalents at beginning of period     231,199 110,118
Cash and cash equivalents at end of period   258,051   258,051
Effect of Change in Accounting Principle        
Cash flows from operating activities:        
Net income   (22)   (30)
Total adjustment in net income       30
Net cash 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