Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Basic EPS:
Net income (loss)	$ (108,303)	$ (477,077)	$ (1,653,971)
Income, share amounts	44,672	44,232
Earnings Per Share, Basic	$ (2.42)	$ (10.79)
Dilutive Securities:
Dilutive RSA's, Shares	0	0
Dilutive RSU's, Shares	0	0
Diluted EPS:
Net Income (Loss) Available to Common Stockholders, Diluted	$ (108,303)	$ (477,077)
Weighted Average Number of Shares Outstanding, Diluted	44,672	44,232
Earnings Per Share, Diluted	$ (2.42)	$ (10.79)
Stock Options [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	1,300	1,300
Restricted Stock [Member]
Earnings Per Share (Textual)
Antidilutive shares excluded from EPS, shares	300	700
Restricted Stock Units (RSUs) [Member]
Earnings Per Share (Textual)
Contingently Issuable Shares Not Included in Diluted EPS	800	1,200