Goodwill and Intangible Assets (Schedule of Weighted Average Amortization Period for Definite Lived Intangible Assets by Major Class) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Weighted average period to amortize acquired intangible assets		13 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period to amortize acquired intangible assets	15 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period to amortize acquired intangible assets	15 years
Management Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period to amortize acquired intangible assets	4 years
Non-compete & Employment Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average period to amortize acquired intangible assets	5 years