Income Taxes (Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Current income tax expense									$ 16,587	$ 5,457	$ 3,659
Deferred income tax (benefit) expense									(2,462)	(1,582)	3,835
Income tax expense	$ 3,336	$ 3,656	$ 3,479	$ 3,654	$ 425	$ 1,370	$ 2,231	$ (151)	$ 14,125	$ 3,875	$ 7,494