Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax [Abstract]
Income tax expense	$ 2,979	$ 2,278	$ 7,547	$ 6,682
Tax benefit relating to compensation expense recognized	0		(300)
Gross unrecognized tax benefits	1,000		1,000		$ 1,000
Mepco [Member]
Valuation Allowance [Line Items]
Valuation allowance against deferred tax assets	$ 1,100		$ 1,100		$ 1,100