Summary of Significant Accounting Policies (Noncontrolling Interest) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance				$ 71,547				$ 74,813	$ 71,547	$ 74,813
Net income attributable to noncontrolling interest	$ 863	$ 1,581	$ 1,102	1,960	$ 668	$ (552)	$ 1,921	2,135	5,506	4,172	$ 7,452
Distributions									(6,682)	(7,438)
Balance	70,726				71,547				70,726	71,547	74,813
With You LLC [Member]
Balance				66,693				67,388	66,693	67,388
Net income attributable to noncontrolling interest									5,607	5,816	6,525
Distributions									(5,126)	(6,511)
Balance	67,529				66,693				67,529	66,693	67,388
DVS LLC [Member]
Balance				2,668				2,651	2,668	2,651
Net income attributable to noncontrolling interest									614	581	564
Distributions									(581)	(564)
Balance	2,701				2,668				2,701	2,668	2,651
FUL [Member]
Balance				$ 2,186				$ 4,774	2,186	4,774
Net income attributable to noncontrolling interest									(715)	(2,225)	363
Distributions									(975)	(363)
Balance	$ 496				$ 2,186				$ 496	$ 2,186	$ 4,774