Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 01, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income taxes
Annual income tax rate (as a percent)				40.10%	38.80%
Statutory federal income tax rate (as a percent)				35.00%	35.00%
Income tax expense		$ 2,341	$ (1,642)	$ 3,952	$ (1,150)
Cable Networks Acquisition | Foreign Tax Credits
Income Taxes
Change in valuation allowance for deferred tax asset	$ 2,500