Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax [Abstract]
Income tax expense (benefit)	$ 2,624	$ 1,847	$ 4,404	$ 3,314
Gross unrecognized tax benefits	1,000		1,000		$ 1,100
Valuation Allowance [Line Items]
Valuation allowance	1,000		1,000		$ 1,000
Mepco [Member]
Valuation Allowance [Line Items]
Valuation allowance against deferred tax assets attributable to Mepco	$ 1,000		$ 1,000