Intangible Assets (Details Textual)	6 Months Ended
	Jun. 30, 2018
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member] | Favorable Lease Agreements [Member]
Finite-Lived Intangible Asset, Useful Life	26 years
Maximum [Member] | Other Intangible [Member]
Finite-Lived Intangible Asset, Useful Life	15 years
Minimum [Member] | Favorable Lease Agreements [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Minimum [Member] | Other Intangible [Member]
Finite-Lived Intangible Asset, Useful Life	1 year