Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 1,088,000	$ 2,490,000	$ 1,583,000
Additions for tax positions of prior years	0	98,000	907,000
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	(9,000)	(652,000)	0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	(848,000)	0
Ending Balance	$ 1,079,000	$ 1,088,000	$ 2,490,000