Equity (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-Based Compensation [Abstract]
Shares outstanding at beginning of period	1,696,130	2,105,152	2,621,686
Shares granted	35,000	119,000	177,000
Shares exercised	(284,791)	(265,675)	(333,395)
Shares forfeited or expired	(150,590)	(262,347)	(360,139)
Shares outstanding at end of period	1,295,749	1,696,130	2,105,152	2,621,686
Shares exercisable at December 31, 2015	1,159,445
Shares vested and expected to vest at December 31, 2015	1,295,749
Weighted average exercise price of options outstanding at beginning of period	$ 13.52	$ 13.34	$ 13.03
Weighted average exercise price of options granted	13.52	14.22	15.62
Weighted average exercise price of options exercised	6.54	5.05	6.84
Weighted average exercise price of options forfeited or expired	21.82	21.02	18.18
Weighted average exercise price of options outstanding at end of period	14.09	$ 13.52	$ 13.34	$ 13.03
Weighted average exercise price of options exercisable at December 31, 2015	14.06
Weighted average exercise price of options vested and expected to vest at December 31, 2015	$ 14.09
Weighted average remaining contractual life (years) outstanding	2 years 9 months 29 days	3 years 10 months 17 days	4 years 10 months 10 days	5 years 6 months 18 days
Weighted average remaining contractual life (years) exercisable at December 31, 2015	2 years 2 months 16 days
Weighted average remaining contractual life (years) vested and expected to vest at December 31, 2015	2 years 9 months 11 days
Aggregate intrinsic value outstanding	$ 1,261	$ 4,435	$ 10,790	$ 11,373
Aggregate intrinsic value exercisable at December 31, 2015	1,261
Aggregate intrinsic value vested and expected to vest at December 31, 2015	$ 1,261