CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income (loss):	$ 15,464	$ (1,971)	$ 406,282
Available-for-sale investment items:
Reclassification of other-than-temporary impairment losses included in earnings	0	0	1,295
Reclassification of realized (gains) losses included in earnings	(795)	(5,311)	833
Total before income taxes	5,196	339	673
Income tax (expense) benefit	(2,003)	300	127
Total	3,193	639	800
Defined benefit pension items:
Net loss arising during the period	0	0	(2,180)
Amortization and settlement included in net periodic cost	0	0	7,107
Amortization of loss included in net periodic cost	0	0	465
Total before income taxes	0	0	5,392
Income tax	0	0	0
Total	0	0	5,392
Total other comprehensive income, net of tax	3,193	639	6,192
Total comprehensive income (loss)	18,657	(1,332)	412,474
Available-for-sale securities
Available-for-sale investment items:
Net unrealized gains (losses) on available-for-sale investments	5,997	5,650	(1,455)
Restricted investments
Available-for-sale investment items:
Net unrealized gains (losses) on available-for-sale investments	$ (6)	$ 0	$ 0