Equity-Method Investments - Schedule of Equity-Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Company’s loss from partially owned entities	$ (139)	$ (27)
Investments in partially owned entities	15,935		$ 15,942
CMAL and CMAH
Schedule of Equity Method Investments [Line Items]
Revenues	12,608	11,570
Operating income	107	28
Net (loss) income	69	(51)
Company’s loss from partially owned entities	(139)	(27)
CMAL
Schedule of Equity Method Investments [Line Items]
Revenues	9,741	9,354
Operating income	23	(144)
Net (loss) income	(2)	(139)
Company’s loss from partially owned entities	(121)	(70)
CMAH
Schedule of Equity Method Investments [Line Items]
Revenues	2,867	2,216
Operating income	84	172
Net (loss) income	71	88
Company’s loss from partially owned entities	(18)	$ 43
Joint Venture
Schedule of Equity Method Investments [Line Items]
Investments in partially owned entities	$ 2,000		$ 2,000