Goodwill and Intangible Assets (Schedule of Acquired Intangible Assets by Major Category) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Total gross carrying amount	$ 44,384	$ 44,384
Total accumulated amortization	(34,361)	(31,893)
Total net carrying amount	10,023	12,491
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total gross carrying amount	32,177	32,177
Total accumulated amortization	(24,276)	(22,038)
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total gross carrying amount	3,440	3,440
Total accumulated amortization	(2,618)	(2,388)
Management Agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total gross carrying amount	3,232	3,232
Total accumulated amortization	(3,232)	(3,232)
Non-compete & Employment Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total gross carrying amount	4,235	4,235
Total accumulated amortization	(4,235)	(4,235)
Insurance Licenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total gross carrying amount	$ 1,300	$ 1,300