Divestiture of Disc Publishing Business (Net Income from Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense			$ 0	$ (1,463)
Net income (loss) from discontinued operations, net of tax	$ (22)	$ 562	(89)	2,806
Disc Publishing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue	0	15,059	0	29,922
Operating income	0	1,475	0	4,617
Income tax expense	0	800	0	1,901
Net income (loss) from discontinued operations, net of tax	$ (22)	$ 562	$ (89)	$ 2,806