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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 11,226 $ (8,534) $ 20,104 $ (3,242)
Unrealized gain (loss) on available-for-sale securities:        
Unrealized gain (loss) arising during the period (980) (644) 1,142 (944)
Reclassification adjustment for gain included in net income 0 (10) (522) (319)
Total change in unrealized loss (gain) on available-for-sale securities (980) (654) 620 (1,263)
Unrealized gain (loss) on cash flow hedge:        
Unrealized gain (loss) arising during the period 388 0 (121) 0
Total change in unrealized gain (loss) on cash flow hedge 388 0 (121) 0
Total other comprehensive income (loss) (592) (654) 499 (1,263)
Comprehensive income (loss) $ 10,634 $ (9,188) $ 20,603 $ (4,505)