Income Tax Provision Narrative Tagging (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Provision [Line Items]
Valuation allowance reversed	$ 405,000
Income tax expense	4,959,000	$ 0	$ 0
Accrued interest or penalties	$ 0	0
Minimum [Member]
Income Tax Provision [Line Items]
Partnership tax returns subjected to examination	2013
Maximum [Member]
Income Tax Provision [Line Items]
Partnership tax returns subjected to examination	2015
Greens Hold Co
Income Tax Provision [Line Items]
Income tax expense		$ 0	$ 0