Income/Loss Per Share - Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Numerator
Income (loss) from continuing operations									$ 47,989	$ (53,629)	$ (19,522)
Income (loss) from discontinued operations, net of income tax expense (benefit) of $0, $0, and $1,976, respectively									0	0	5,379
Net income (loss)	$ 52,914	$ 12,278	$ (4,998)	$ (12,205)	$ (15,173)	$ (8,600)	$ 7,194	$ (37,050)	$ 47,989	$ (53,629)	$ (14,143)
Weighted-average common shares outstanding:
Basic (in shares)									46,552	46,004	45,381
Assumed conversion of employee stock options (in shares)									2,235	0	0
Assumed conversion of Platinum Warrant (in shares)									6,602	0	0
Weighted-average shares outstanding (diluted)									55,389	46,004	45,381
Net income (loss) per basic share:
Loss from continuing operations (in dollars per share)									$ 1.03	$ (1.17)	$ (0.43)
Income (loss) from discontinued operations (in dollars per share)									0.00	0.00	0.12
Net income (loss) (in dollars per share)	$ 1.13	$ 0.26	$ (0.11)	$ (0.26)	$ (0.33)	$ (0.19)	$ 0.16	$ (0.81)	1.03	(1.17)	(0.31)
Net income (loss) per diluted share:
Loss from continuing operations (in dollars per share)									0.87	(1.17)	(0.43)
Income (loss) from discontinued operations (in dollars per share)									0.00	0.00	0.12
Net income (loss) (in dollars per share)	$ 0.93	$ 0.22	$ (0.11)	$ (0.26)	$ (0.32)	$ (0.19)	$ 0.14	$ (0.80)	$ 0.87	$ (1.17)	$ (0.31)