Income Taxes Reconciliation of Statutory Federal Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income tax expense (benefit)	$ 181	$ (134)	$ 2,590
PHL [Member]
Statutory federal tax expense (benefit)	(418)	(618)	1,367
State income tax expense (benefit), net of federal tax (benefit) expense	231	(110)	111
Other	335	270	181
Income tax expense (benefit)	$ 148	$ (458)	$ 1,659