Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Effective income tax rate	269.00%	24.00%	48.00%	9.00%
Increase in income tax benefit	$ 300,000		$ 1,400,000
Decrease in income tax expense		$ 532,000		$ 1,600,000
Tax provision			565,000
Valuation allowances against deferred tax assets	2,500,000		2,500,000		$ 2,500,000
Net deferred tax liability	$ 25,300,000		$ 25,300,000		$ 28,800,000