CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 402,989	$ (2,480)
Other comprehensive income (loss):
Net unrealized losses on available-for-sale investments	(386)	0
Income tax benefit	149	0
Total	(237)	0
Defined benefit pension items:
Net loss arising during the period	(409)	0
Settlement included in net periodic cost	240	0
Amortization of loss included in net periodic cost	132	97
Income tax benefit	14	0
Total	(23)	97
Total other comprehensive income, net of tax	(260)	97
Total comprehensive income (loss), net of tax	$ 402,729	$ (2,383)