Income Taxes (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Dec. 22, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Examination [Line Items]
Effective tax rate		26.50%		35.00%
Blended state and federal statutary rate		24.90%
Income tax provision		$ 1,700
Increased to effective tax rate		1.60%
Total effective tax rate		13.40%
Income tax expense		$ 3,088	$ 3,252
Scenario, Plan [Member]
Income Tax Examination [Line Items]
Effective tax rate		21.00%
Interest Expense [Member]
Income Tax Examination [Line Items]
Percentage of limitation of tax deduction	30.00%
Net Operating Loss [Member]
Income Tax Examination [Line Items]
Percentage of limitation of tax deduction	80.00%