Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Apr. 12, 2016	Dec. 31, 2015	Jul. 22, 2015	Apr. 01, 2015
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 617,080		$ 585,787
Cracked
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets		$ 9,300
Goodwill		$ 29,700
Midroll Media
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash				$ 635
Accounts receivable				2,925
Intangible assets				10,700
Goodwill				45,586
Other long-term assets				482
Total assets acquired				60,328
Current liabilities				3,365
Net purchase price				$ 56,963
Journal Communications, Inc.
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash					$ 2,529
Accounts receivable					47,978
Other assets					2,236
Property, plant and equipment					123,264
Intangible assets					294,800
Goodwill					456,440
Other long-term assets					6,350
Assets held for sale					14,500
Total assets acquired					948,097
Accounts payable and accrued liabilities					38,107
Employee benefit obligations					85,261
Long-term deferred liability					57,112
Long-term debt					126,873
Other long-term liabilities					4,744
Net purchase price					$ 636,000