Investments in Unconsolidated Entities Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Revenues	$ 118,324	$ 87,033	$ 72,393
Operating income	11,790	8,171	9,878
Income from continuing operations	1,658	2,140	4,603
Net income	477	940	$ 4,598
Equity Method Investment, Summarized Financial Information, Assets [Abstract]
Current assets	75,453	56,599
Non-current assets	465,361	491,388
Total assets	540,814	547,987
Equity Method Investment, Summarized Financial Information, Liabilities [Abstract]
Current liabilities	32,234	31,191
Non-current liabilities	239,581	222,156
Total liabilities	$ 271,815	$ 253,347