Income taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets [Abstract]
Provision for doubtful accounts	$ 614	$ 1,020
Accrued rent	1,572	1,748
Reserve for newsstand returns	100	139
Accrued compensation	4,854	10,464
Deferred royalty revenue	1,582	1,165
NOL/credit carryforwards	62,766	59,868
Depreciation	5,374	6,071
Amortization of intangible assets	6,054	7,756
Other	208	242
Total deferred tax assets	83,124	88,473
Deferred Tax Liabilities [Abstract]
Prepaid expenses	(585)	(293)
Amortization of intangible assets	(7,094)	(7,117)
Total deferred tax liabilities	(7,679)	(7,410)
Valuation allowance	(82,539)	(88,180)
Net Deferred Tax Liabilities	$ (7,094)	$ (7,117)