Income Taxes Income Taxes (Details 5) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1, 2016	$ 2,462,000	$ 1,629,000
Additions for tax positions related to the current year	67,000	354,000
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	1,593,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(776,000)	(101,000)
Additions for tax positions related to prior years		580,000
Balance at December 31, 2016	$ 160,000	$ 2,462,000