Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (2,239,643)	$ (326,720)	$ 10,577
Other comprehensive loss
Pension and postretirement benefit plan - net actuarial loss	1,104
Other comprehensive loss	(1,104)
Comprehensive income (loss)	$ (2,240,747)	$ (326,720)	$ 10,577