CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (61,980)	$ (80,129)	$ (95,453)	$ (137,294)
Other comprehensive loss:
Change in pension and postretirement obligations, net of tax of $(5) and $(11) in 2015	(11)	(10)	(38)	(21)
Total Other Comprehensive Income (Loss), Net of Tax	(11)	(10)	(38)	(21)
Comprehensive loss	$ (61,991)	$ (80,139)	$ (95,491)	$ (137,315)