Summary of Significant Accounting Policies New Accounting Pronouncements or Change in Accounting Principle (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for income taxes	$ 3,491,000	$ 9,711,000	$ 13,904,000
Effective Income Tax Rate Reconciliation, Percent	37.10%	26.60%	41.00%
Operating Lease, Right-of-Use Asset	$ 7,562,000	$ 8,698,000
Operating Lease, Payments	2,095,000	1,909,000	$ 1,860,000
Operating Lease, Liability, Noncurrent	7,762,000	9,331,000
Operating Lease, Liability, Current	$ 1,584,000	1,432,000
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		0
Operating Lease, Payments		0	0
Payments for Other Fees		(155,000)	(165,000)
Operating Lease, Liability, Noncurrent		0
Noncurrent operating lease liabilities		2,065,000
Operating Lease, Liability, Current		0
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		8,698,000
Operating Lease, Payments		1,062,000	1,042,000
Operating Lease, Liability, Noncurrent		9,331,000
Noncurrent operating lease liabilities		(2,065,000)
Operating Lease, Liability, Current		1,432,000
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		8,698,000
Operating Lease, Payments		1,062,000	1,042,000
Payments for Other Fees		(1,217,000)	(1,207,000)
Operating Lease, Liability, Noncurrent		9,331,000
Noncurrent operating lease liabilities		0
Operating Lease, Liability, Current		1,432,000
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payments for Other Fees		$ (1,062,000)	$ (1,042,000)