Income Taxes (Components of income tax expense (benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract
Deferred Income Tax Expense (Benefit)	$ 2,443	$ 2,033
Income Tax Expense (Benefit)	$ 9,204	$ 5,661