Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ 12,786 $ (22,354)
Change in unrealized losses (3,018) (2,745)
Net losses reclassified into earnings 15,235 17
Other comprehensive income (loss) 12,217 (2,728)
Total comprehensive income (loss) $ 25,003 $ (25,082)