Earnings Per Share Reconciliation of the weighted-average shares outstanding used in the calculation of basic and diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ (232,460)	$ 10,646	$ (211,183)	$ 25,361
Basic weighted-average common shares outstanding	40,946	40,540	40,843	40,677
Assumed exercise of dilutive stock options and restricted stock units	0	607	0	742
Diluted weighted-average common shares outstanding	40,946	41,147	40,843	41,419
Income from Continuing Operations:
Basic earnings per share	$ (5.68)	$ 0.26	$ (5.17)	$ 0.62
Diluted earnings per share	$ (5.68)	$ 0.26	$ (5.17)	$ 0.61