Debt (Banc of America Digital Projector Loan) (Narrative) (Details) - USD ($) $ in Thousands		2 Months Ended	3 Months Ended	12 Months Ended
	Feb. 05, 2018	Apr. 30, 2018	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Contractual facility			$ 290,879	$ 252,929
US Banc Of America Digital Projector Loan [Member]
Debt Instrument [Line Items]
Contractual facility	$ 4,600	$ 4,900	$ 1,979	$ 2,604
Interest rate	5.00%