Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax [Abstract]
Income tax expense	$ 2,621	$ 1,957
Gross unrecognized tax benefits	800		$ 800
Mepco [Member]
Valuation Allowance [Line Items]
Valuation allowance against deferred tax assets	$ 1,100		$ 1,100