Condensed Consolidated Statements of Comprehensive Income Loss (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Tax benefit (provision) for amortization of deferred loss	$ 0	$ 7	$ 0	$ 14
Tax benefit (provision) for amortization of prior service cost	$ 7	$ 2	$ 14	$ 4