Equity Compensation (Schedule of Equity Compensation Stock Options Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity Compensation [Abstract]
Number of options outstanding at beginning of period	33
Number of options granted	0	0
Number of options exercised	(11)
Number of options forfeited	0
Number of options expired	0
Number of options outstanding at end of period	22
Number of options exercisable at end of period	22
Weighted average exercise price outstanding at beginning of period	$ 19.69
Weighted average exercise price options granted	0.00
Weighted average exercise price options exercised	20.56
Weighted average exercise price options forfeited	0.00
Weighted average exercise price options expired	0.00
Weighted average exercise price outstanding at end of period	19.24
Weighted average exercise price exercisable at end of period	$ 19.24
Weighted average remaining contractual term outstanding at end of period, years	1 year 9 months 23 days
Weighted average remaining contractual term exercisable at end of period, years	1 year 9 months 23 days
Aggregate intrinsic value outstanding at end of period	$ 375
Aggregate intrinsic value exercisable at end of period	$ 375