Revenue from Contracts with Customers (Capitalized Contract Cost) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract costs capitalized during the period	$ 17,815
Costs amortized during the period	(31,856)
Change in capitalized contract cost, other	(1,386)
Balance of costs to obtain a contract	$ 15,593	$ 31,020