Equity Compensation and Employee Benefit Plans (Equity Compensation Expense and Related Income Tax Benefit Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock Options
Equity Compensation [Abstract]
Pre-tax compensation expense	$ 6	$ (25)	$ 30
Tax benefit	2	(9)	11
Stock expense, net of tax	4	(16)	19
Restricted Stock
Equity Compensation [Abstract]
Pre-tax compensation expense	3,244	2,337	1,875
Tax benefit	1,265	886	722
Stock expense, net of tax	1,979	1,451	1,153
Performance Shares
Equity Compensation [Abstract]
Pre-tax compensation expense	1,459	167	2,514
Tax benefit	569	63	968
Stock expense, net of tax	$ 890	$ 104	$ 1,546