CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings
BALANCE at Dec. 31, 2013	$ 353,783	$ 1,216	$ 152,556	$ 200,011
BALANCE (in shares) at Dec. 31, 2013		12,166
Increase (Decrease) in Stockholders' Equity
Net income (loss)	43,881	$ 0	0	43,881
Issuance of stock through compensation plans, including income tax benefits	130	$ 0	130	0
Issuance of stock through compensation plans, including income tax benefits (in shares)		4
BALANCE at Dec. 31, 2014	397,794	$ 1,216	152,686	243,892
BALANCE (in shares) at Dec. 31, 2014		12,170
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(98,196)	$ 0	0	(98,196)
BALANCE at Dec. 31, 2015	299,598	$ 1,216	152,686	145,696
BALANCE (in shares) at Dec. 31, 2015		12,170
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(292,151)	$ 0	0	(292,151)
Sale of common stock	147,340	$ 506	146,834	0
Sale of common stock (in shares)		5,051
Issuance of stock through compensation plans, including income tax benefits	5,744	$ 41	5,703	0
Issuance of stock through compensation plans, including income tax benefits (in shares)		410
BALANCE at Dec. 31, 2016	$ 160,531	$ 1,763	$ 305,223	$ (146,455)
BALANCE (in shares) at Dec. 31, 2016		17,631