Discontinued Operations - Cash Flows (Details) - Digital - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation	$ 9,700	$ 8,149	$ 19,570	$ 15,531
Amortization	$ 16,670	$ 22,476	40,300	44,773
Capital expenditures			34,482	23,138
Payments for acquisitions, net of cash acquired			$ 0	$ 53,552