Segment Information (Textual) (Details) - segment	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
Segment Reporting Information [Line Items]
Number of reportable segments (business segments)	4
Number of consolidated segments	2
Number of segments accounted for as equity method investments	3
LTG
Segment Reporting Information [Line Items]
Remaining equity interest percentage acquired in equity investee		67.50%