Discontinued Operations - Cash Flows (Details) - Digital - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation	$ 0	$ 9,421	$ 19,569	$ 24,843
Amortization	$ 0	$ 23,385	40,300	68,159
Capital expenditures			37,441	38,825
Payments for acquisitions, net of cash acquired			$ 0	$ 196,750