Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Amortization of actuarial loss included in net income (loss), tax expense (benefit)	$ (408)	$ (427)	$ (160)
Actuarial gain (loss) arising during the period, tax expense (benefit)	$ 1,737	$ (300)	$ (2,663)