Income Taxes Unrecognized Benefit (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 2,373,000	$ 1,944,000	$ 1,651,000
Prior period tax positions	0	0	188,000
Current period tax positions	456,000	492,000	269,000
Lapse of statute of limitations	(391,000)	(63,000)	(164,000)
Balance at end of year	2,438,000	2,373,000	$ 1,944,000
Unrecognized tax benefits that would impact effective tax rate	845,000
Interest and penalties in income tax expense related to unrecognized tax positions	43,000	46,000
Income tax penalties and interest accrued	$ 574,000	$ 531,000