Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income (loss) attributable to common stockholders $ 17,167 $ 7,670 $ 103,382 $ (67,912)
Other comprehensive income (loss):        
Change in net unrealized (losses) gains on cash flow hedges (797) 237 (1,608) (1,040)
Net cash flow hedge losses reclassified to operations 277 333 974 987
Total comprehensive income (loss) $ 16,647 $ 8,240 $ 102,748 $ (67,965)