Income Taxes (Narrative) (Details) - USD ($)		12 Months Ended
	Oct. 27, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Uncertain income tax positions		$ 249,000	$ 0
Basis in partnerships		22,922,000	24,773,000
One-time income tax benefit		0	0	$ 25,244,000
Deferred tax assets		67,755,000	80,814,000
Interest and penalties expense		0	0	$ 0
Accrued expenses		0	$ 0
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward		$ 116,600,000
Operating loss carryforward, expiration date		Dec. 31, 2029
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward		$ 21,300,000
Valuation allowance related to state loss carryforwards		$ 21,300,000
Reverse Recapitalization
Operating Loss Carryforwards [Line Items]
One-time income tax benefit	$ (26,600,000)
Deferred tax assets	63,900,000
Reverse Recapitalization | Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	182,300,000
Reverse Recapitalization | State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	$ 21,600,000