Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Loss Carryforwards [Line Items]
Effective income tax rates	25.20%	63.40%	(15.10%)	(11.20%)
Income tax expense	$ 1,686,000	$ 3,316,000	$ 3,670,000	$ 5,865,000
Unrecognized tax benefits	1,300,000		1,300,000
United States Tax Authority
Operating Loss Carryforwards [Line Items]
Net deferred tax assets	$ 0		$ 0