Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income $ 25,324 $ 14,239
Other comprehensive income (loss):    
Change in net unrealized losses on cash flow hedges (852) (402)
Net cash flow hedge losses reclassified to operations 317 323
Total comprehensive income $ 24,789 $ 14,160