Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income (loss) attributable to common stockholders $ 60,891 $ (89,821) $ 86,215 $ (75,582)
Other comprehensive income (loss):        
Change in net unrealized gains (losses) on cash flow hedges 40 (875) (811) (1,277)
Net cash flow hedge losses reclassified to operations 381 331 697 654
Total comprehensive income (loss) $ 61,312 $ (90,365) $ 86,101 $ (76,205)