CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 25,900	$ 89,661	$ (111,394)	$ 8,102
Other comprehensive income (loss):
Change in pension and postretirement obligations, net of tax of $(6) and $(17) in 2015 and $14 and $40 in 2014	(11)	25	(32)	74
Total Other Comprehensive Income (Loss), Net of Tax	(11)	25	(32)	74
Comprehensive income (loss)	$ 25,889	$ 89,686	$ (111,426)	$ 8,176