Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets [Abstract]
Accrued liabilities	$ 2,027	$ 1,710
Bad debt reserve	328	497
Net operating losses	483	893
Deferred compensation	2,579	3,851
Intangibles	4,097	3,624
Total deferred tax assets	9,514	10,575
Deferred Tax Liabilities [Abstract]
Prepaid expenses	902	965
Accounting method change	1,366	3,096
Goodwill and intangibles	13,975	18,172
Fixed assets	631	1,195
Total deferred tax liabilities	16,874	23,428
Net deferred tax liability	$ 7,360	$ 12,853