Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense/(benefit)	$ 1,053	$ (38)
Federal and state income taxes, amount	$ 1,200
Tax benefit from stock-based compensation arrangements		$ 500
Effective income tax rate, percent	22.60%	(3.00%)
Accounting Standards Update 2014-09
Income Tax Disclosure [Abstract]
Income tax expense/(benefit)		$ (38)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefits associated with share-based compensation, amount		$ 500