Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Examination [Line Items]
Deferred tax assets related to acquisitions of non controlling interests	$ 400,000
Revaluation of redeemable non-controlling interests	2,400,000
Deferred tax assets related to acquired interests	7,400,000
Adjustment to the deferred tax assets related to acquisitions of non controlling interests	2,700,000
Offset to adjustment, reduction in the previously reported tax receivable	2,900,000
Additional-paid-in-capital	200,000
Tax receivable included in other current assets	2,300,000	$ 3,400,000
Reduction of the income tax provision	1,000,000
Increase in current state income tax provision	34,000	147,000	$ 223,000
Accrued interest and penalties associated with any unrecognized tax benefits	0	0	0
Interest expense recognized	$ 0	$ 0	$ 0
Federal [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Periods open for examination	2015
Federal [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Periods open for examination	2013
State [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Periods open for examination	2015
State [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Periods open for examination	2012