Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income (loss)	$ 69,306	$ 79,306	$ (21,054)
Unrealized holding gains (losses):
Before tax	37,173	(2,054)	1,513
Tax effect	(14,918)	711	(588)
Net of tax	22,255	(1,343)	925
Reclassification of net gains (losses) included in net income (loss):
Before tax	8,097	34,164	(921)
Tax effect	(3,311)	(13,973)	377
Net of tax	4,786	20,191	(544)
Net unrealized holding gains (losses)	17,469	(21,534)	1,469
Derivative instruments
Before tax	(1,930)	0	0
Tax effect	792	0	0
Net of tax	(1,138)	0	0
Unrealized holding (losses) gains:
Before tax	(9,127)	17,600	(6,520)
Tax effect	3,733	(7,198)	2,667
Net of tax	(5,394)	10,402	(3,853)
Total other comprehensive income (loss)	10,937	(11,132)	(2,384)
Total comprehensive income (loss)	$ 80,243	$ 68,174	$ (23,438)