Condensed Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net (loss) income	$ (1,826)	$ 31,537	$ (2,020)	$ 31,288
Other comprehensive income (loss): Defined benefit pension plans:
Amortization of prior service costs	(20)	(35)	5	(70)
Amortization of actuarial loss	299	184	516	367
Other comprehensive income	279	149	521	297
Comprehensive (loss) income	$ (1,547)	$ 31,686	$ (1,499)	$ 31,585