Equity (Stock Plans) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014	Dec. 31, 2013
Stock Plans
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,149,887		767,559		711,376	423,325
Restricted stock units outstanding	83,043		37,407		83,043	37,407
Restricted Stock Units, vesting period	13 months
Restricted stock issued during period ( in shares)	640,865	[1]	450,065	[1]
Share-Based Compensation, restrictions lapsed, number of shares	(202,354)	[2]	(105,831)
Stock Issued during period, Value, Restricted Stock Award	$ 4.48		$ 4.20
Restricted stock units, vested	37,407
Share-Based Compensation, percentage of restrictions that lapse	25.00%
Number of years over which restrictions lapse	4 years
Shares Paid for Tax Withholding for Share Based Compensation	60,376		33,592
Equity Option [Member] | Maximum
Stock Plans
Term of options	10 years
Equity Option [Member] | Independent members of the board of directors
Stock Plans
Outstanding options (in shares)	75,000
Weighted average exercise price (in dollars per share)	$ 6.69
Exercisable period after the date of grant for the grants made in 2008 and thereafter	1 year

[1] Shares issued in 2015 had a grant price of $4.48 per share. Shares issued in 2014 had a grant price of $4.20 per share.

[2] 60,376 and 33,592 of these shares were surrendered in 2015 and 2014, respectively, to pay withholding tax.