Selected Unaudited Quarterly Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended											12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Unaudited Quarterly Financial Information [Abstract]
Net sales	$ 33,929	[1]	$ 144,598	[2],[3]	$ 113,645	$ 46,977	$ 56,886	[2]	$ 186,707	$ 200,985	$ 82,986	$ 339,149	$ 527,564	$ 553,615	$ 581,288
Gross profit	3,505	[1]	45,134	[2],[3]	37,010	8,833	21,123	[2]	72,458	79,378	30,902	94,482	203,861	216,050	244,944
Total operating expenses	78,797	[1]	81,624	[2],[3]	40,159	34,538	39,765	[2]	71,760	36,478	35,027	235,118	183,030	181,128	180,878
Income (loss) from operations	(75,292)	[1]	(36,490)	[2],[3]	(3,149)	(25,705)	(18,642)	[2]	698	42,900	(4,125)	(140,636)	20,831	34,922	64,066
Net income (loss)	$ (76,166)	[1]	$ (124,212)	[2],[3]	$ (2,026)	$ (16,368)	$ (11,783)		$ 63,937	$ 26,373	$ (3,290)	$ (218,772)	$ 75,237	$ 84,009	$ 86,452
Net income (loss) per common share:
Basic and diluted	$ (1.08)	[1]	$ (1.77)	[2],[3]	$ (0.03)	$ (0.23)						$ (3.12)
Basic							$ (0.17)	[2]	$ 0.93	$ 0.38	$ (0.05)	$ (3.12)	$ 1.09	$ 1.23	$ 1.29
Diluted							$ (0.17)	[2]	$ 0.90	$ 0.37	$ (0.05)	$ (3.12)	$ 1.07	$ 1.19	$ 1.24

[1] Includes a tax benefit due to the release of valuation allowances. Refer to Note 11 - "Income Taxes" for additional information.

[2] Includes a tax provision due to the increase of valuation allowance. Refer to Note 11 - "Income Taxes" for additional information.

[3] Includes a goodwill impairment charge. Refer to Note 7 - "Goodwill" for additional information.