Shareholders' Equity (Details) (Restricted Stock Units (RSUs) [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restricted stock units under the 2006 and 2011 Incentive Plan [Abstract]
Maximum shares granted to employees (in shares)	700,000		700,000
Terms for stock vesting if earlier than five years			Each award vests at the end of five years from the date of grant, or at the time a recipient retires after reaching age 65, if earlier
Restricted Stock Units vested (in shares)	2,000	0	75,000	69,000
Shares withheld upon vesting (in shares)			23,000	22,000
Fair value of vested Restricted Stock Units	$ 63		$ 3,045	$ 2,405
Compensation expense for 2006 and 2011 incentive plans	$ 222	$ 312	$ 791	$ 839
2006 Incentive Plan [Member]
Restricted stock units under the 2006 and 2011 Incentive Plan [Abstract]
Award vesting period	5 years
2011 Incentive Plan [Member]
Restricted stock units under the 2006 and 2011 Incentive Plan [Abstract]
Award vesting period	5 years