Segment Reporting (Net Sales by Product Portfolio Segment) (Details) (USD $) In Thousands, 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
Segment Reporting Information [Line Items]
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
Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							100.00%					100.00%		100.00%	100.00%
Multimedia learning platforms [Member]
Segment Reporting Information [Line Items]
Net sales							43,800					231,800		441,200	463,100
Multimedia learning platforms [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							77.00%					68.00%		80.00%	80.00%
Learning toys [Member]
Segment Reporting Information [Line Items]
Net sales							11,900					102,300		109,500	113,500
Learning toys [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							21.00%					30.00%		19.00%	19.00%
All other [Member]
Segment Reporting Information [Line Items]
Net sales							1,200					5,100		2,900	4,700
All other [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							2.00%					2.00%		1.00%	1.00%
United States [Member]
Segment Reporting Information [Line Items]
Net sales							39,145					232,736	368,031	386,983	424,816
United States [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							100.00%					100.00%		100.00%	100.00%
United States [Member] | Multimedia learning platforms [Member]
Segment Reporting Information [Line Items]
Net sales							30,800					164,700		318,500	353,000
United States [Member] | Multimedia learning platforms [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							79.00%					71.00%		82.00%	83.00%
United States [Member] | Learning toys [Member]
Segment Reporting Information [Line Items]
Net sales							7,200					63,500		66,100	68,000
United States [Member] | Learning toys [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							18.00%					27.00%		17.00%	16.00%
United States [Member] | All other [Member]
Segment Reporting Information [Line Items]
Net sales							1,100					4,600		2,400	3,800
United States [Member] | All other [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							3.00%					2.00%		1.00%	1.00%
International [Member]
Segment Reporting Information [Line Items]
Net sales							17,741					106,413	159,533	166,632	156,472
International [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							100.00%					100.00%		100.00%	100.00%
International [Member] | Multimedia learning platforms [Member]
Segment Reporting Information [Line Items]
Net sales							13,000					67,100		122,700	110,100
International [Member] | Multimedia learning platforms [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							73.00%					63.00%		74.00%	70.00%
International [Member] | Learning toys [Member]
Segment Reporting Information [Line Items]
Net sales							4,700					38,800		43,400	45,500
International [Member] | Learning toys [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							26.00%					36.00%		26.00%	29.00%
International [Member] | All other [Member]
Segment Reporting Information [Line Items]
Net sales							$ 100					$ 500		$ 500	$ 900
International [Member] | All other [Member] | Net sales [Member]
Segment Reporting Information [Line Items]
Concentration percentage							1.00%					1.00%		0.00%	1.00%

[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.